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How are rocks formed from cooling magma?

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Rock Formed by Cooling and Hardening. One type of rock gets its start deep in the Earth in huge underground pockets. There, the rock is so hot that it melts. This molten rock, called magma, is like a soup of different minerals and elements. read more

You asked how rocks form from cooling magma. Well here is one way. When that high pressure gas FINALLY escapes from the sticky felsic magma it shreds the magma into tiny pieces of jagged glass and cools the magma very rapidly and shoots it up into the air. read more

Any rock that forms from the cooling of magma is an igneous rock. Magma that cools quickly forms one kind of igneous rock, and magma that cools slowly forms another kind. When magma rises from deep within the earth and explodes out of a volcano, it is called lava, and it cools quickly on the surface. read more

When magma cools at the surface, it cools rapidly and does not have time to form very large crystals. Basalt, found on the ocean floor, is an example of an extrusive igneous rock. On the other hand, magma that cools slowly beneath the Earth's surface forms rocks that contain large crystals. read more

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