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

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

3. 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

4. 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

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

7. 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?