1 Starter 6:30-8:30 13:30-18:44

2 Metamorphic and Igneous RocksLearning Objectives: Describe how metamorphic rocks are formed. Describe how igneous rocks are formed. Explain how cooling speed affects the size of crystals formed.

3 Rocks can be pushed deep underground and turn into metamorphic rock under the right conditions.

4 Metamorphic Rock FormationMetamorphic rocks are formed when rocks are under high heat and high pressure from being deep underground.

5 The high heat and high pressure makes the rocks have a chemical change.The high pressure is what causes the crystals to be flattened and form stripes.

6 Rocks Melt to form MagmaIf rocks get pushed even further into the Earth, the temperature is so high that the rocks will melt turning into magma.

7 Formation of Igneous RocksMagma = molten (hot liquid) rock deep underground Lava = magma that is above ground Igneous rocks are formed when magma or lava cools and solidifies.

8 Crystal Size Depends on the Speed of CoolingExtrusive igneous rocks – magma “exits”, lava cools quickly in the air and forms rocks with small crystals (not enough time for crystals to grow) Intrusive igneous rocks – magma is “in” the ground, magma cools slowly underground and forms rocks with large crystals

9 Crystal Size Depends on the Speed of CoolingFast Cooling Above Ground Slow Cooling Below Ground

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11 Review https://www.youtube.com/watch?v=_hhwkMagUV0&t=13s