Types of Stress.

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Presentation transcript:

Types of Stress

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

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

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

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

Compression Squeezes rock until it folds or breaks Crust pushes together

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