1. Types of Stress

2. Stress
A stress is a force that acts on rocks to change its shape or volume
The force adds energy to the rock until it breaks or changes shape

3. Causes Unequal heating and cooling in the Earth’s mantle
Results in Earthquakes

4. Shearing Stress that pushes rock mass in two opposite directions.
Crust slides side by side
Evidence of this?

6. Tension Pulls on the crust
Stretching the rock so it is thinner in the middle
Crust pulls apart

7. Compression Squeezes rock until it folds or breaks
Crust pushes together

10. Rock has two options when these stresses are present
1. Rock Folds
2. Rock breaks