Deep under your feet, rock can get so hot that it melts into a thick glowing mush. That melted rock underground is called magma. When magma finds a way up and spills onto Earth's surface, we give it a new name: lava. Same hot rock, two places, two words. Learning the difference helps you talk about volcanoes like a young geologist. Magma stays hidden until an opening lets it rise.
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Say it this way: magma is melted rock underground, and lava is magma that reaches the surface.