Cold science knowledge quiz 1. Some cold science knowledge
1. Why does sorbet bubble?
Sorbet bubble because there are a lot of invisible water vapor in the outside air, when encountering very cold sorbet, a cold liquefied into droplets surrounded by sorbet, it seems to be the sorbet in the "bubble" as.
2. Why are sunflowers always facing the sun?
The stem of the sunflower contains a wonderful plant growth hormone. This growth hormone is very afraid of light. As soon as the light irradiation, it will go to the backlight side, at the same time it also *** backlight side of the cell rapid reproduction, so the backlight side than the light side of the growth of the fast, so that the sunflower produces a light-focused bending.
3. Why do cicadas molt?
The outer shell (exoskeleton) of a cicada is hard and cannot be expanded as the cicada grows. When the cicada grows to a certain stage, the cicada's exoskeleton restricts the cicada's growth, and the cicada sheds its original exoskeleton, which is the cicada molt.
4. How do bees make honey?
The bee first picks the flowers sweet juice spit into an empty hive, at night, and then suck the sweet juice to their own honey stomach modulation, and then spit it out, and then swallowed, so that by turns swallowed, to be carried out 100 to 240 times, and finally brewed into sweet honey
5, hung on the wall of the quartz clock, when the battery runs out of power and stop walking, its second hand often stop in the dial on the "9" position. This is due to the second hand in the "9" position by the gravity moment of the largest obstruction. Science Knowledge
6, sometimes the water pipe in the neighboring faucet when the water, occasional bursts of sound. This is due to the water from the faucet when rushing out of the water pipe caused by **** vibration.
7, to take pictures of the TV screen, you should turn off the camera flash and indoor lighting, so that the picture taken by the picture is clearer. Because the flash and lighting on the TV screen reflected light will interfere with the transmitted light of the TV screen.
8. Frozen meat thaws faster in water than in air at the same temperature. A burning nail cools faster in water than in air of the same temperature. A cup filled with boiling hot water cools faster when immersed in water than in air at the same temperature. These phenomena show that: the heat transfer of water is better than air,
9, pots of cold water, the bottom of the pot attached to the outer surface of the water droplets in the flame longer to be burned dry, and until the drying is not boiling, this is due to the droplets of water, the pot and the pot of water in the three to maintain the heat conduction, the temperature is roughly the same, as long as the pot of water is not boiling, the droplets will not boil, the droplets of water evaporate in the flame and gradually by the burned dry.
10, out of shape mirror, the farther away from the mirror, the more out of shape. Because the mirror like by the mirror after the reflection of the silver-plated surface formation, silver-plated surface is not flat or uneven thickness of the glass will produce out of shape. Out of shape mirror, the farther away from the mirror, by the principle of light amplification, the silver-plated surface of the reflected light arrives at the location of the deviation from the normal position of the larger, the mirror is more out of shape.
2. Does anyone know the most cold science and technology essay
Science Essay Sample 1: Why the trunk is round In the process of observing nature I stumbled upon the trunk of a tree in the form of an approximate round - empty cone shape.
Why are tree trunks cone-shaped? What are the benefits of conical trunks? To explore these questions, I made more in-depth observations, analyzed and researched. With the help of my tutor, I consulted relevant information and learned that the stem of a plant has the role of supporting the plant body and transporting water and other nutrients.
The stems of trees are mainly composed of vascular bundles. The supporting role of the stem is mainly borne by the xylem wood fibers, although the stems of woody plants will be thickened from year to year, but within a certain time frame, the number of wood fibers in the stem is a certain amount of wood fibers, that is, the cross-sectional area of the tree stem is a certain amount of wood fibers.
Next, we centered on the tree stem cross-sectional area is certain, assuming that the trunk cross-section grows into different shapes, designing experiments to explore the reasons for and advantages of the cone shape of the tree trunk. After the experiment, we found that: (1) the cross-sectional area and length of a certain, trigonometric objects longitudinal support maximum, the minimum transverse force; cylindrical objects longitudinal support is not as good as trigonometric objects, but the maximum transverse force; (2) equal mass of different shapes of tree trunks, short cone-shaped trunks to withstand the wind maximum; (3) the wind is a natural phenomenon that affects the shape of the tree cross-section and tree The wind is a natural phenomenon that affects the shape of the cross-section of the tree and the height of the tree growth.
Nearly cone-shaped trunk, low center of gravity, coupled with a huge root system and the earth connected together, the center of gravity fell even lower, the stability is greater; (4) the trunk cross-section is rounded, which can reduce the damage, has a stronger mechanical strength, and can withstand the attack of the wind. At the same time, by the wind, the trunk of each place of the similar degree of bending, no matter which direction the wind comes from, the trunk to withstand the similar size of the resistance, the trunk is not easy to be damaged.
The above experiments reflect the laws of nature, nature gives us inspiration: (1) the cross-section of the triangular column-shaped object, with the maximum longitudinal support, its form can be used in construction, such as angle steel, etc.; (2) cross-section is a rounded circular object, with the maximum transverse force, similar form of building materials can be found everywhere, such as TV towers, poles, etc.. In my observation, testing and analysis process, gradually explain, reveal the trunk is cone-shaped mystery, growth of knowledge, the knowledge learned in connection with the practical application, both consolidate the knowledge gained, but also improve the interest in learning, but also initially learned the scientific observation and analysis methods.
范文2：皮鞋为什么越擦越亮 Every Sunday, I always have to complete my mom's task of polishing shoes. I'll tell you, this is the source of my pocket money for a week! After getting dusty shoes, I first wipe off the dust on the surface of the shoes, and then coated with shoe polish, carefully rubbed a rub, shoes will become bright and good-looking.
But why is this I looked for the same brand of the same style of the old and new two pairs of shoes for comparison and observation. I first touched the two pairs of shoes with my hands, and found that the surface of the new shoes is much smoother than the surface of the old shoes.
The old shoes were coated with shoe polish and carefully rubbed, although much brighter, but still can not be compared with the new shoes. Is the brightness of leather shoes related to the smoothness of the surface? I took a pair of old shoes that hadn't been wiped, and under a magnifying glass the uppers looked bumpy.
Then, I then circled the two surfaces on the shoes are more rough A and B area, A area coated with shoe polish and carefully wiped, the B area is not coated with shoe polish as a blank control. I found that the A area after wiping, the surface obviously become much smoother, and put in the sunlight than the B area has a glossy.
Why the two will produce such a difference? I thought of the teacher in physics class once said: theater walls are uneven surface, so that most of the sound is absorbed, so that the audience is not disturbed by the echo. By the same token, light shining on the surface of any object will be reflected, if the plane is uneven, the light will be scattered in all directions; if the plane is smooth, then we can see the reflected light in a certain direction.
The surface of leather shoes is not absolutely smooth, if it is an old leather shoes, its surface is of course even more uneven, so it can not make the light reflected in a certain direction, so it looks like there is no luster. The shoe polish has some small particles, and these small particles can just fill in the pits on the surface of the shoes when you polish them.
If you then use a cloth to wipe, so that the shoe polish coated more evenly, it will make the surface of the leather shoes become smooth, flat, reflecting the ability to strengthen the light. Through the experiment, I finally know the secret of the brighter shoes! 范文3：醋对花卉有什么影响 Vinegar is a common condiment in life, and flowers can purify the ecological environment and beautify our lives.
Have you ever thought that vinegar and flowers have something to do with it? With curiosity, we carried out the investigation of this topic. According to rich experience in planting flowers told us that the potted flowers apply some vinegar solution, can improve the growth of potted flowers, increase the flowers, and flowers and leaves.
This was quickly confirmed in our experiments. Different concentrations of vinegar solution, have different effects on flowers? This was the second phase of our experiment.
We selected the same growth of four pots of Manzanita, primrose, moon flower, divided into four groups, each group (three pots) each have three kinds of flowers, respectively, numbered and labeled. At the same time, we take edible white vinegar formulated into 1% (pH value of 2~3), 0.01% (pH value ≈ 4), 0.0001% (pH value ≈ 6) three different concentrations of the solution, every day, respectively, to the three groups of pots of flowers to fix the spraying of a kind of vinegar solution, the fourth group of pots of flowers sprinkled with vinegar-free water.
The growth of the flowers was observed and recorded every five days. The results of this experiment are: spraying a low concentration of vinegar (pH ≈ 6) has no significant impact on these flowers; spraying a medium concentration of vinegar (pH ≈ 4) of the flowers obviously grow better than the other groups, more buds, bloom earlier, and the color of the flowers is more colorful, and the flowering period is also prolonged; spraying a high concentration of vinegar pH 2-3, on the contrary, make the flowers wither prematurely.
Through this experiment, we can tell you: planting flowers properly sprayed some vinegar, can make flowers grow better. But to master the concentration of vinegar, acetic acid is too thick will hurt the flowers.
3. There is no cold knowledge to share
1. Look at your zipper, if there are YKK three letters on it, then it means that this is the world's largest manufacturer of zippers Yoshida Kogyo Kabushibaisha's products 2. 40% of McDonald's profits come from the sale of Happy Meals 3. 1996 version of the of Webster's Dictionary has 315 spelling errors 4. An average of 12 newborns are given to the wrong parents every day 5. Chocolate is deadly to dogs, and it only takes a few ounces to kill a puppy from heart and nervous system damage 6. Ketchup was sold as a medicine in the 1830s 7. Leonardo da Vinci could write with one hand while drawing with the other 8. Scissors were invented by Leonardo da Vinci 9. It took Leonardo da Vinci 10 years to paint the lips of the Mona Lisa 10. Oscars awarded during World War II were made of wood because metal was a scarce commodity at that time 11. Casinos in Las Vegas do not have clocks 12. Bruce Lee's movements were so fast that it was hard to see them, so he had to slow down the film when he made the movie 13. Lying on one's back and lifting one's legs up slowly can save you from getting stuck in the quicksand 14. 14. Mosquito repellent does not repel mosquitoes but interferes with the mosquitoes' sensory organs so that they can't find out where people are 15. Dentists recommend that toothbrushes should be placed at least 6 feet away from the lavatory in order to avoid flushing the toilet when the particles produced and floated in the air 16. The earliest product to be barcoded was Wrigley's chewing gum 17. Michael Jordan receives more income from Nike each year than the combined salaries of Nike factory workers in Malaysia. 18. Marilyn Monroe had six fingers on one foot 19. Hitler's mother considered having an abortion, but was discouraged by her doctor 20. 40 pounds of skin will be shed in a lifetime 21. If you are bitten by a crocodile, poke the crocodile in the eyeballs and it will let you go 22. It takes an average of seven minutes for a person to fall asleep 23. The yo-yo was used as a weapon in the Philippines 24. Cats are the only domesticated animal not mentioned in the Bible 25. 25. Rubber bands keep better when refrigerated 26. 56% of keyboarding is done by the left hand 27. "dreamt" is the only English word that ends in "mt" 28. Cockroaches can survive for 10 days even without a head 29. You can't keep your eyes open when you sneeze 30.Mexico City sinks 10 inches a year 31.The brain is more active when you sleep than when you watch TV 32.80% of Americans like the color blue the best 33.There are more chickens than people on the planet 34.The nails of the thumb are the slowest to grow, and the nails of the middle finger are the fastest to grow 35.In the U.S., there are more telephones in Washington, D.C., than there are people 36.The 48 poorest countries are not even close to being the richest three families in the world 37.The 48 poorest countries are not as rich as the world's richest families 37. The three richest families in the world 37.The first president of Marlboro Cigarettes died of lung cancer 38.Smart people have more zinc and copper in their hair 39.The world's youngest parents were a pair of Chinese children in 1910, aged 8 and 9 40.How big our eyes were at birth is still how big they are now.
But noses and ears grow all the time 41. Sleeping uses more calories than watching TV 42. People die in about 10 days without sleep 43. Chewing gum while cutting onions prevents you from tearing up 43. The Mona Lisa doesn't have eyebrows 44. If the moon is just above your head, you lose a little weight 45. Alexander Bell, who invented the telephone, never gave his mother or his wife a copy of the phone. Alexander Bell, who invented the telephone, never called his mother or his wife because they were deaf 47. "I am." is the shortest complete sentence in the English language 48. Like fingerprints, everyone's tongue is different 49. "Bookkeeper" is the only word in the English language that repeats a letter three times in a row. "Bookkeeper" is the only word in the English language that repeats a letter three times in a row. 50. Right-handed people live nine years longer on average than left-handed people. 51. "The quick brown fox jumps over the lazy dog" uses all the letters of the alphabet in the English language. 52. If all the Chinese walk past you in a line, due to over-height, you'll find that you'll be able to see them all. If all the Chinese walked past you in a line, the line would never end because of the high birth rate 53. More people use English in China than in the U.S. 54. **Every square inch of skin contains 20 feet of blood vessels 55. The average person uses the restroom 6 times a day 56. Babies are born with 300 bones, and then have only 206 57. Beards are the fastest-growing **hair**. If a man never trims his face, he will grow a 30-foot beard over the course of his life. 58. What came first, the chicken or the egg? According to Genesis 1:20-22, the chicken came first 59. The longest place name still in use is: -, which is a hill in New Zealand 60. If you left Tokyo on a plane at 7:00 a.m., when you arrived in Honolulu, the time was 4:30 p.m. yesterday 61. Scientists at Australia's Pacis Observatory thought they were receiving radio waves from an extraterrestrial civilization. After investigation, it was found that the waves actually came from a microwave oven in the observatory 62. wearing earplugs for an hour, the number of bacteria in the ear will be 700 times higher than the original 63. a French kiss can exchange more than 40,000 parasites and 250 kinds of bacteria 64. men have better eyesight than women, and women have better hearing than men 65. Coca-Cola was initially green 66. the most common name in the world The most common name in the world is: *** 67. If you don't count "north" and "south," all seven states have the same first and last letters in the English language 68. The average American has two credit cards 69. typewriter" is the longest English word that can be written with a single row of keys on a QWERTY keyboard 70. twice as many women are blind as men 71. people don't die from holding their breath 72. when you sneeze, your heart stops beating for about 1 millisecond 73. pigs can't see the sky 74. Sixth sick sheik's sixth sheep's sick" is the most tongue-twisting catchphrase in the English language 75. Sneezing too violently can crack your ribs, and trying to hold in a sneeze will rupture a blood vessel in your neck or skull, which can be fatal 76. Each of the K's in a suit of playing cards represents a great king in history: spades are King David, clubs are Alexander the Great, clubs are Alexander the Great, and the king of the house of God is the king of the United States. Spades are Alexander the Great, Hearts are Charles the Great, and Diamonds are Julius Caesar 77.111,111,111 x 111,111,111 = 12,345,678,987,654,321 78.When you see a statue of a knight, if the horse is on all fours, the man died in battle 79.Ditto if the horse's one front foot is up, the man died of serious wounds sustained in battle 80. battle and died of serious injuries 80. ditto, if the horse landed on all four feet, then the man died of natural causes 81. honey doesn't spoil 82. a crocodile can't stick out its tongue 83. a snail can sleep for three years at a time 84. all polar bears are left-handed 85. in 1987 American Airlines reduced the number of olives by one for each salad served to the first class cabin.
4. Cold knowledge: 12 very interesting cold knowledge, the tenth you know
Life has a lot of unknown cold knowledge is easy to be ignored, the following take a look at these interesting cold knowledge, there are certainly you do not know! After reading these cold knowledge again, I found myself a lot smarter!
1, according to statistics each year, donkeys killed more people than those killed in airplane crashes (small donkeys?).
2, the inventor of air conditioning Caryl is known as the "father of refrigeration", but the original design of the air conditioning is for the machine, to prevent the printing ink disorder.
3, winter sleep not cover the head, summer sleep not exposed belly;
4, fatigue, do not drink coffee or strong tea. Otherwise it will cause great harm to the cardiovascular system, panic is one of the manifestations of this symptom.
5, drink a large bottle of Coke, can be put upside down, so it is less likely to leak.
6. Have a sense of humor. American physiologist Robert Provine said that keeping a sense of humor can improve the level of immune cells.
7. "GOTopless" is an American women's organization that fights for equal rights, claiming that women have the same right to *** breasts in the public ****.
8. Neurological exams are often used to test a person's ability to calculate, usually: 100 minus 7 is how much? What is 100 minus 7?
9, the ancestor of the domestic cat is presumed to have originated from the desert cats of ancient Egypt, the Persian cat of Persia, has been domesticated by humans for three and a half decades (but not completely domesticated like the dog).
10, sesame oil is more suitable for middle-aged and elderly people to eat
11, Brittany Peninsula (northwestern France) scallops to be transported to China to clean, and then sent back to France to cook and eat.
12, take a close look at the shape of the Super Mario grass and the shape of the clouds
5. Kneeling on the popular science category of the rapid quiz questions and answers bank
Compilation of popular knowledge of food safety 1, at present, China's food safety supervision and management of the principle of what? In accordance with the principle of supervision of a regulatory link by a department, to take sectional supervision as the main, varieties of supervision as a complementary way to further rationalize the function of food safety supervision, clear responsibility.
2, the local people at all levels *** What is the responsibility for food safety supervision? The State Council "on further strengthening food safety work of the decision", the requirements of "strengthening local *** on food safety supervision" responsibility. Local people at all levels *** of local food safety is responsible for, unified leadership, coordination of food safety supervision and rectification work in the region.
3, *** What are the responsibilities of the main food regulatory functions? Quality Technology Supervision Department is responsible for the supervision of food production and processing of the main functional departments; industry and commerce departments are responsible for the supervision of food circulation; health departments are responsible for the catering industry and canteens and other consumer supervision; food and drug supervision departments are responsible for the comprehensive supervision of food safety, organization and coordination and according to the law to organize the investigation and handling of major accidents.4. 4, China's first batch of food safety credit system construction of the pilot industry is which? Meat, grain, children's food 3 industries.
5. What are the specific requirements of the state environmental conditions for the origin of pollution-free agricultural products? Origin environment in line with the standard requirements of pollution-free agricultural production environment, the regional scope of a clear, with a certain scale of production.6, food quality and safety market access system applies to the main body is what? Food quality and safety market access system is applicable to the main body of the food quality and safety market access system is applicable to the main body of all engaged in the production and processing of food products in the domestic sales of citizens, legal persons or other organizations.
7, "QS" mainly includes which three elements? First, the implementation of food production license system for food production enterprises, second, the implementation of mandatory inspection of food production enterprises system, third, the implementation of food production licensing system for the implementation of quality and safety of food market access labeling system 8, in order to ensure product quality and safety, food production and processing enterprises on the raw and auxiliary materials, what are the requirements? Food production and processing of raw and auxiliary materials used must comply with the appropriate national standards, industry standards and relevant regulations, may not use non-food raw materials for the production of food. Directly for food production and processing of water must meet the GB5749 "drinking water health standards" requirements.
9, the implementation of food production license management of vinegar products include? Brewing vinegar and prepared vinegar. Vinegar essence is not included in the scope of licensing.
10. What are the prohibited substances in the country? Animal and plant pathogens (including strains, poisonous species, etc.), pests and other harmful organisms, animal carcasses and soil.11 What are the main contents of food labeling? Food name, ingredient list, net content and solids content, factory name, batch number, date mark and so on.
12, the limited use of the product must be labeled what? Should be clearly marked in a prominent position in the production date and safe use or expiration date 13, health food registration, approval by which department in charge? The State Food and Drug Administration in charge of the national health food registration and management, responsible for the approval of health food.14. What are the circumstances, health food advertising approval number should be withdrawn? Health food approval documents are revoked; health food by the relevant state departments ordered to stop production, sales; advertising review failed.
15, major food safety incidents in the emergency plan for the accident is how to grade? Divided into particularly major food safety incidents (Level I), major food safety incidents (Level II) larger food safety incidents (Level III), general food safety incidents (Level IV). 16, how to confirm the larger food safety incidents (Level III)? Meet one of the following circumstances, for the larger food safety incidents: (1) the scope of the accident involves the city (prefecture) level administrative area within the administrative area of more than two counties, to the people's dietary safety to bring a serious danger; (2) causing injury to more than 100 people, or the emergence of fatal cases; (3) the city (prefecture) level of the people *** determined that the more significant food safety incidents.
17, at present, the State General Administration of Quality Supervision, Inspection and Quarantine **** on how many categories of food to implement the "QS" market access system? 28 categories. Respectively, the old 5 categories: wheat flour, rice, edible vegetable oil, soy sauce, vinegar; new 10 categories: meat products, dairy products, beverages, condiments (sugar and monosodium glutamate), instant noodles, cookies, canned food, frozen drinks, puffed food, frozen rice and noodles; the new 13 categories: confectionery products, tea, wine, beer, wine, pickled vegetables, preserved vegetables, fried products, egg products, cocoa products, roasted coffee, aquatic products, starch and starch products. processed products, starch and starch products.
18, the World Health Organization (WHO) announced the world's top ten junk food is which? Fried food, preserved food, processed meat, cookies (excluding low-temperature baking and whole wheat cookies), soda and cola, convenience food (mainly refers to instant noodles and puffed food), canned food (including fish and meat and fruits), candied plums and preserves, frozen desserts, barbecue food.19 What is the main problem of chemical contamination of poor-quality children's food? The abuse of food additives is the main problem of chemical contamination in poor quality children's food.
20, "three no" food is what? No factory name and address, no factory certificate of conformity, no shelf life of the food. 21, what are the dietary habits that hinder the development of adolescents? Not regular quantitative eating, partiality, eat high sugar, high salt, high fat food, obsessed with fast food, indiscriminate use of tonic drugs.
22, affecting the safety of food pollution of heavy metals are mainly? The main lead, mercury, cadmium. 23, in the Chinese domestic market sales of imported food, must use which of the following text identification? Chinese.
24, the world recognized three major carcinogens in food is what? Mainly present in which? Benzo(a)pyrene, nitramine and aflatoxin are recognized in the world in the food can produce the three major carcinogens, which, benzopyrene contamination occurs mainly in smoked and baked foods, some foreign fast food such as French fries, pancakes, roast pork, fruit desserts on the brown crunchy fried food there is also a benzo(a)pyrene; nitramine is mainly from meat and its products to add nitrites and nitrates; aflatoxin is found in moldy corn. Aflatoxin is mostly found in moldy corn. 25. What are the "four big killers" in unsafe food? Hanging white, hydrogen peroxide, formaldehyde and sulfur.
26, the scientific method of drinking milk? Drinking bags of milk must be boiled before drinking; the best with steamed bread, bread, corn porridge, beans and other foods; should not be with.
6. Science knowledge information
Dust is something everyone hates, it hinders the environment? It's a good way to get rid of the dust and jeopardize human health.
Therefore, throughout the ages, people have always been "diligent in wiping, do not make the dust. But have you ever thought that human beings can't live without dust?
If there was no dust in nature, what would we be facing? Dust particles are generally between one ten thousandth and one millionth of a millimeter in diameter. The dust that the human eye can see is the behemoth of dust, and the tiny dust can only be seen under a high powered microscope.
The main sources of dust are soil and rocks. They are weathered and split into tiny particles.
These particles float in the air along with other particles of organic matter. They absorb some of the sun's light while reflecting it in all directions, like countless point sources of light.
The sunlight is reflected by the dust, which weakens its intensity and makes it softer. If there were no dust in the atmosphere, the sunlight would be so strong that people would not be able to open their eyes.
Interestingly, dust particles also have an "odd temperament", reflecting shorter wavelengths of violet, blue, and cyan light, and "preferring" to absorb longer wavelengths of other colors. Because of the higher dust content in the lower atmosphere, the sky we see on the ground is azure blue.
If there were no dust in the atmosphere, the sky would be white. Dust is mostly hygroscopic.
The water vapor in the air must be attached to the dust in order to condense into small water droplets. In this way, when the air is saturated with water vapor, the dispersed water vapor will cling? Dust and the formation of stable water droplets, can float in the air for a long time.
If there were no dust in the air, everything on the ground would be wet. Worse, there would be no clouds in the sky, no rain or snow to regulate the climate, and the water that evaporated from the ground to the sky would not be able to return to the ground.
If the water on Earth becomes less and less, and eventually dries up completely, organisms will not be able to survive.
If the Earth's water were to become less and less, and eventually dry up completely, living creatures would not be able to survive.
The refraction of sunlight by these small droplets of water makes it possible to see the evening sunshine, the misty clouds, and the rainbows.
If there is no dust in the air, nature will be more monotonous! The role of dust tells us that everything has its two sides, even if some people regarded as "waste" things, often also has its existence value can not be ignored. Only a correct understanding of them, in order to avoid harm and benefit mankind.
Is it this one or the following one Fine dried and powdered earth or powdered particles of other substances; something that has been turned into a fine part; a fine powder. Dust is the enemy of human health, so people especially hate it, because it carries a lot of bacteria and viruses and insect eggs flying around, spreading disease.
Industrial dust, fiber dust can make workers suffer from a variety of incurable occupational diseases, too much dust will also cause environmental pollution, affecting people's normal life and work, inducing human respiratory diseases and so on. However, the credit of the dust must not be erased.
If there is no dust in the atmosphere, sunlight is not absorbed, reflected, scattered and refracted, the sky is not too bright, is too dark. As the dust is hygroscopic particles, without it this core, the air can not condense the water vapor, the sky clouds are difficult to form, the surface of the ground lost the cloud cover, will become arid and barren, the weather is not too hot, is too cold.
Without dust, many of the universe's harmful rays would break into the Earth's surface unimpeded and pose a deadly threat to humans and all sorts of creatures. Although dust is many things it is not, it is also invaluable in that it enables the Earth to gently access the sun's energy, and also enables the atmosphere to have enough condensation nuclei to increase the chances of cloud and rain formation; and regulates the temperature of the earth's surface so that it is suitable for the survival and reproduction of life.
7. What are the information of science trivia
Science trivia can be divided into natural sciences, social sciences and thinking sciences according to the different objects of study.
1. Natural science is about natural phenomena of various specific sciences, the study of the nature and laws of nature.
For example, mathematics, physics, chemistry, astronomy, geography, biology and so on.
2. Social sciences are specific sciences about social phenomena that seek to reveal the nature and laws of society.
For example, economics, political science, military science, sociology, management, education and so on.
3. The humanities are the specific sciences of human cultural phenomena, which seek to reveal the nature and laws of the social and cultural fields.
For example, linguistics, history, archaeology, ethics, aesthetics, religion and so on.
Popularization of scientific knowledge is referred to as popular science, also known as popular science or popular science, refers to the use of a variety of media in a simple, easy for the public to understand, accept and participate in the way to the general public to introduce the knowledge of natural sciences and social sciences, to promote the application of science and technology, advocate the scientific method, the dissemination of scientific ideas, and carry forward the spirit of science activities. Science popularization is a kind of social education.