Volcanoes are cracks in Earth's crust that allow molten rock and hot gases to escape. According to the U.S. Geological Survey (USGS), there are about 1,350 volcanoes worldwide that have the ...
Heavier plates can slide beneath lighter ones, heating and melting the rock and creating magma. Volcanoes form as the magma rises through the Earth's crust. The Kilauea volcano in Hawaii’s ...