vocabulary magma: hot molten rock under the earth’s surface lava: hot molten rock above the...
TRANSCRIPT
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Igneous RocksIntrusive and Extrusive
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Igneous rocks are VOLCANIC ROCKS
They are molten rock that cools either above or below the Earth’s surface.
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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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Let’s see it in action…
http://www.classzone.com/books/earth_science/terc/content/investigations/es0603/es0603page05.cfm?chapter_no=investigationhtt