1. 3.4 Metamorphic rocks form as existing rocks change

2. Classifying Rocks
3 rock types
Sedimentary
Igneous
Metamorphic

3. Metamorphism
The process by which existing rock is changed by pressure or heat

4. Metamorphic Rocks “change”
Igneous and sedimentary rocks that have changed due to heat and pressure
Heat and pressure cause new combinations or new crystals to form
**heating and cooling of in mantle layer may lead to this formation

5. Metamorphic

6. Parent Rock
The original rock went through metamorphism. (the rock changed)
Ex: igneous rock and sedimentary rock “melting” together to form this new metamorphic rock)
A metamorphic rock CAN be a parent to another metamorphic rock
One rock, “melting” and turning into another

7. Changes in Metamorphism
Rocks may flatten and pushed together
Rocks may “melt” together to form new rocks

8. Recrystallization
The process by which bonds between atoms in minerals break and re-form in new ways during metamorphism

9. Bands in Rocks
Foliation: the arrangement of minerals in flat or wavy parallel bands.
Found in rocks made of
2 or more minerals

10. Foliated metamorphic rocks Slate Gneiss

11. Nonfoliated Rock Metamorphic rock without foliation (bands/stripes)
Primarily made of 1 mineral
Not subject to high pressure

12. Non foliated metamorphic Rocks Marble Quartzite

13. Brain Pop