作业帮火山形成英文简介RT
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火山形成英文简介RT
火山形成英文简介
RT
火山形成英文简介RT
A volcano is a place on the Earth's surface (or any other planet's or moon's surface) where molten rock,gases and pyroclastic debris erupt through the earth's crust.Volcanoes vary quite a bit in their structure - some are cracks in the earth's crust where lava erupts,and some are domes,shields,or mountain-like structures with a crater at the summit.