1. Today’s Agenda… 4-26 Bellringer: How do igneous rocks form?
Finish notes from yesterday
Notes on Metamorphic Rock
Study Pack #3
Homework

2. Igneous Rocks How do igneous rocks form?
What is the difference between intrusive and extrusive igneous rocks?
How do basaltic, granitic, and andesitic rocks compare?
Types of Igneous Rock

3. Metamorphic Rocks
Study Pack #3
Page 67

4. Today’s Goals…
I can describe the conditions in Earth that cause metamorphic rocks to form.
I can classify metamorphic rocks as foliated or nonfoliated.

5. Metamorphic Rock
Rocks that have changed because of changes in temperature and pressure or the presence of hot, watery fluids are called metamorphic rocks
Change form, composition, or both
Can form from igneous, sedimentary, or other metamorphic rock – parent rocks

6. Metamorphic Rock
Do not form when rock melts, only when it is close enough to magma to be heated up

7. Metamorphic Rock
Rocks are under great pressure from layers of rocks above them
Temperature increases with depth in the Earth
See it happen!

8. Metamorphic Rock
Granite to Gneiss
Shale to Slate

9. Metamorphic Rocks
Sometimes hot fluids move through a rock and change its chemical composition
Page 68, Figure 8

10. Classifying Metamorphic Rock
Rocks can be classified based on their composition and texture
Foliated
Nonfoliated

11. Foliated Rocks Rocks have layers of mineral grains
Example: slate and gneiss

12. Foliated Rocks
Slate is used for paving pools and patios and roofing and tiling many surfaces

13. Nonfoliated Rocks
Little or no layering
Example: quartzite, marble