volcanic rock
It will push forward until it reaches the bottom or finally cools down. They destroyed everything on the road. Among the hazards of volcanoes, lava flows may pose the least threat to life because people can run out of the route of lava flows.
jet
Volcanic ejecta varies in size, from pebble-sized fragments to hot lava from big rocks, which can spread to a considerable extent. Volcanic ash, on the other hand, can cover a wider area, and part of the dust can be carried high into the air and spread all over the world, thus affecting the weather.
tephra
Volcanic ash is not ash, but powdery rock in the form of steam and gas clouds. It is irritating, and its weight can make the roof collapse. Volcanic ash will suffocate crops, block traffic arteries and waterways, and be accompanied by toxic gases, which will do harm to the lungs, especially to children, the elderly and patients with respiratory diseases. Only when the gas is close to the volcanic eruption and concentrated enough can it cause harm to healthy people. However, when the sulfur in volcanic ash falls with the rain, it will produce sulfuric acid (and other characteristics) in a large area and density, which will burn the skin, eyes and mucous membranes.
Gas ball
A sphere composed of gas and dust can roll down a volcano at a speed of more than 160 km per hour. This phenomenon is called hot cloud by scientists. It is hot and red, and it moves very fast. If there is no solid underground building nearby, the only chance of survival may be to jump into the water; Hold your breath for about half a minute, and the ball will roll over.
mud-rock flow
Volcanic eruption will melt ice and snow, causing ice disaster. Or accompanied by soil, a mudslide, the so-called Rajal, moving at a speed as high as 100 km/h, will bring devastating consequences. This tragedy happened in Colombia 1985. In the narrow valley, the height of Rajal can reach 30 meters, and they are dangerous for a long time after the eruption of the main volcano. Even if the volcano is dormant, if the heat generated by it is enough to cause the ice and snow to melt, there will be potential dangers. Heavy rain will cause mudslides.