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Effects of Magma Cooling Rate on Igneous Rock Texture

Explore how the cooling speed of magma impacts the texture of igneous rocks, differentiated into intrusive and extrusive types. Intrusive rocks form beneath the Earth's surface with large crystals due to slow cooling, while extrusive rocks form on the surface with small crystals from fast cooling.

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Effects of Magma Cooling Rate on Igneous Rock Texture

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  1. 7 December 2012 Objective: Explain how the cooling rate of magma affects the texture of igneous rock. INTRO • Where do igneous rocks come from? Here’s a hint: The world igneous comes from a Latin word that means “fire.”

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

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

  4. 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

  5. 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. Igneous Rock LAB • Name – use the chart inside the box • Extrusive = small mineral grains • Intrusive = large mineral grains

  8. 7 December 2012 Objective: Explain how the cooling rate of magma affects the texture of igneous rock. OUTRO What’s the difference between intrusive and extrusive?

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