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Igneous Rocks

Igneous Rocks. Intrusive and Extrusive. Igneous rocks are VOLCANIC ROCKS. They are molten rock that cools either above or below the Earth’s surface. Vocabulary. Magma: hot molten rock under the Earth’s surface Lava: hot molten rock above the Earth’s surface

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Igneous Rocks

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  1. Igneous Rocks Intrusive and Extrusive

  2. Igneous rocks are VOLCANIC ROCKS They are molten rock that cools either above or below the Earth’s surface.

  3. 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.

  4. Intrusive Igneous Rocks • Intrusive rocks are formed when MAGMA cools underground. • It is called intrusive because it INTRUDES on other rock layers

  5. 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).

  6. Extrusive Igneous Rocks • Extrusive Rocks are formed when LAVA cools above the Earth’s surface. • They are called extrusive because they EXplode

  7. 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).

  8. Let’s see it in action… http://www.classzone.com/books/earth_science/terc/content/investigations/es0603/es0603page05.cfm?chapter_no=investigationhtt

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