Forces Within Earth

What is stress

• Force per unit area

• point at which rocks fail and generate an earthquake

• measure of the deformation of rock

What is strain

• Force per unit area

• measure of the deformation of rocks

• speed seismic waves travel

What happens to a rock that undergoes elastic deformation once the stress is removed?

• The rock does not change shape.

• The rock returns to its original shape

• The rock breaks to generate an earthquake.

Stress that pushes a mass of rock in two opposite

• Fault

• Shearing

• Soil

Pulls on the crust,stretching rocks so that it becomes thinner in the middle

• Tension

• Folds

• Syncline

Which type of fault occurs due to tension in the Earth's crust?

• Normal fault

• Reverse Fault

• Strike-Slip Fault

Squeezes rock until it folds or breaks

• Compression

• Fold

• Breaking

Is a break in Earth's crust where slabs of crust slip past each other

• Slide

• Fold

• Fault

Which type of fault occurs due to compression in the Earth's crust?

• Normal Fault

• Reverse Fault

• Strike slip fault

Which type of fault is the San Andreas Fault in California?

• Strike slip fault

• Reverse Fault

• Normal fault