With little scientific knowledge, children are full of curiosity about everything around them, so parents should know some small scientific common sense in order to satisfy their curiosity. Here is some information about science that I have compiled for you. Let's have a look!
Little knowledge of science 1 1, a planet without the sun.
A rogue planet is a planet that floats in the universe and does not revolve around any star.
There used to be huge dragonflies in ancient times.
Meganeura appeared about 300 million years ago, almost as big as a seagull, with wings spread about 65 cm long. Insects usually don't grow so big, and scientists are still looking for the reason why they can grow so big.
Millions of years ago, because of the moon, the day was shorter than now.
Because the distance between our earth and the moon has changed, the earth's rotation has slowed down. It used to turn very fast and the days became shorter and shorter. At first, there were about 385 days in a year, less than 23 hours a day. This is proved by geological evidence.
There are almost no sugar substitutes in the world.
Sucralose is the main chemical component of sugar substitute, which was discovered by a scientist when he asked his colleagues to "test this chemical". His colleagues listened to the test as a taste and then found out. He is also very lucky, but fortunately it is only sucralose, and there are no other toxic substances.
There is a mysterious cave in Minnesota.
There is a waterfall in the devil's kettle, which flows to the deep hole in the rock below, but where did it go after that? Nobody knows.
6. The fire vortex is actually like a water tornado.
Rotating wind can take away flames and water, but it will form a burning tornado.
7. The highest cliff record is on the satellite.
The highest cliff, called Verona Rupes, is located in moon Miranda, a satellite of Uranus. It is measured as high as 5- 10 km, which is about 10 times the depth of the Grand Canyon. Due to the low gravity of Tianweiwu, it takes 12 minutes to fall to the bottom.
8. If an asteroid wants to create a disaster, it doesn't have to really "hit" the earth.
1908, an asteroid fell into the earth's atmosphere and landed in central Russia. Although it disintegrated at an altitude of 8 or 5 kilometers, the 150 shock wave with the power of Hiroshima atomic bomb still destroyed 800 square miles of Siberian forest.
9. All the planets in the solar system can fit into the distance between us and the moon.
Planets of the solar system is about 376,369 kilometers in diameter, which sounds very long. The distance between the earth and the moon is 384,955 kilometers, which can be stuffed in!
1 0, the Mediterranean almost dried up into a point.
About 5.3 million years ago, the Mediterranean was completely isolated from other sea areas after structural transformation. In fact, it began to evaporate. However, after the opening of the Strait of Gibraltar, the Atlantic Ocean began to inject seawater into the Mediterranean basin, which was called the Zagreb flood.
Scientific knowledge 2 1. What is the function of preservatives? Where is it usually used? (The function is to prevent food from mildewing and rotting, and to inhibit the growth of bacteria and mold. Commonly used in the production of ham, sausage, fish, canned meat and other foods)
Eating too much pigment will damage your health. Where do you usually use the pigments in your life? (Used for ice cream, cakes, refreshing drinks, dried fish, jam and other foods)
3. What is green food? (Green food refers to pollution-free, safe and high-quality nutritious food approved by China Green Food Development Center).
4. What are the components of green food signs in China? (composed of sun, leaves and buds)
5. What is the main composition of air? (Nitrogen, oxygen, ozone and various other gases)
6. What is the function of the earth's ozone layer? The ozone layer is a very important layer in the atmosphere, which can absorb most of the ultraviolet rays in the sun and protect life on earth from excessive ultraviolet radiation.