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

2. Metamorphic and Igneous Rocks
Learning 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 Formation
Metamorphic 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 Magma
If 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 Rocks
Magma = 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 Cooling
Extrusive 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 Cooling
Fast Cooling
Above Ground
Slow Cooling
Below Ground

11. Review