火山形成英文简介RT

1个回答

  • 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.