Igneous rocks
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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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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

  • Mineral: Molecules arranged in a regular pattern that are the “ingredients” of rocks.


Intrusive Igneous Rocks

  • Intrusive rocks are formed when MAGMA cools underground.

  • It is called intrusive because it INTRUDES on other rock layers


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).


Extrusive Igneous Rocks

  • Extrusive Rocks are formed when LAVA cools above the Earth’s surface.

  • They are called extrusive because they EXplode


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).


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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