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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

Igneous Rocks

Intrusive and Extrusive


Igneous rocks are volcanic rocks
Igneous rocks are VOLCANIC ROCKS

They are molten rock that cools either above or below the Earth’s surface.


Vocabulary
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 Igneous Rocks

  • Intrusive rocks are formed when MAGMA cools underground.

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


Intrusive igneous rocks1
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 Igneous Rocks

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

  • They are called extrusive because they EXplode


Extrusive igneous rocks1
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
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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