Igneous Rocks Explain how the cooling rate of magma affects the texture of igneous rock.

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Presentation transcript:

Igneous Rocks Explain how the cooling rate of magma affects the texture of igneous rock.

Igneous Rocks Igneous Rocks Igneous is Latin for FIRE Forms when molten rock cools and hardens Can form deep in Earth or on surface

Igneous Rocks Two types: Intrusive igneous rock Rock formed from cool and solidification of magma beneath Earth’s surface Slow cooling magma = large mineral crystals Large crystals = course (rough) grained rock

Igneous Rocks Extrusive igneous rock Rock that forms as result of volcanic activity or cools on Earth’s surface Fast cooling = small mineral crystals Small crystals = fine (smooth) grained rock

Igneous Rocks Summary: What is an igneous rock? What is the difference between extrusive and intrusive igneous rocks?

29 November 2011 Objective: Explain how the cooling rate of magma affects the texture of igneous rock. OUTRO What’s the difference between intrusive and extrusive?