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Published byJemima Carson Modified over 8 years ago
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Vocabulary Magma: hot molten rock under the Earth’s surface Lava: hot molten rock above the Earth’s surface Mineral: Molecules arranged in a regular pattern that are the “ingredients” of rocks.
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Intrusive Igneous Rocks Intrusive rocks are formed when MAGMA cools underground. It is called intrusive because it INTRUDES on other rock layers
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Intrusive Igneous Rocks Intrusive rocks cool SLOWLY because they are underground where it is hotter. Because they cool slowly they have BIGGER crystals (crystals have more time to grow).
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Extrusive Igneous Rocks Extrusive Rocks are formed when LAVA cools above the Earth’s surface. They are called extrusive because they EXplode
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Extrusive Igneous Rocks Extrusive rocks cool more QUICKLY because they are out in the open Because they cool more quickly they have SMALLER crystals (crystals have less time to grow).
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