火山的喷发为人类探索地壳内部的奥秘展示了壮丽的一幕,它们多种不同的喷发方式令人叹为观止。一些火山喷发出火红的熔岩流,而另一些却吐出高高的火山灰,在大气中爬升几十英里,落下以后在附近广大地区形成厚厚的火山灰覆盖层。火山的成因火山是地球深处运动变化的产物。地球核心是由固态的铁质和包围其外的富铁的液态外核构成。地核以外是化学上与之不同的、含氧化硅的地幔。它一直延伸到距地核4100英里的 The volcanic eruption shows the magnificent scene of the human exploration of the mysteries of the interior of the earth’s crust, and their various eruptions are breathtaking. Some volcanic eruptions of red lava flow, while others spit out high volcanic ash, climbing tens of miles in the atmosphere, after falling in the vast area around the formation of thick volcanic ash cover. Causes of Volcano Volcano is the product of changes in the depths of the Earth. The Earth’s core is made of solid iron and the iron-rich liquid outer core that surrounds it. Outside the core are chemically different, silica-containing mantle. It stretches 4100 miles from the Earth’s core