1. Metamorphic Rocks
Formed from heat and pressure changing the original or parent rock into a completely new rock.
The parent rock can be either sedimentary, igneous, or even another metamorphic rock.

2. Where does the pressure come from?
Pressure comes from:
The weight of all the rock above
Plate collisions (Regional Metamorphism)

3. Regional Metamorphism

4. How do high temperatures metamorphose rocks (without melting)?
Rocks are heated when:
they get buried, because it gets warmer as you go deeper
they are near magma and get heated, especially as hot mineral rich water moves through it and reacts with it – Contact Metamorphism
New minerals can be formed in metamorphic rocks when atoms are exchanged between neighboring minerals within the . rock.
Different combinations of heat and pressure can turn one . rock into several different metamorphic ones.

5. Contact Metamorphism

6. Characteristics of Metamorphic Rocks
Foliated - Parallel alignment of flattened mineral grains and pebbles
Caused when rock is squeezed and grains or crystals flatten and line up in parallel layers
Rocks with foliated stripes made of different minerals are called banded.
Unfoliated - Rocks that are not banded and do not break into layers

7. Metamorphic Rocks
Gneiss
Quartzite
Garnet Schist
Slate

8. Unfoliated
Marble
Quartzite

9. Deformation is the change in the shape of a rock caused by a force placed on it.
Gneiss
Shale

10. Parent Rocks Shale, mudstone or siltstone can become slate
Slate can become phyllite
Phyllite can become schist
Schist can become gneiss
Granite can become gneiss
Sandstone can become quartzite
Limestone can become marble

12. The Rock Cycle