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Inside Earth 2:1
Ch. 2:1 Earths crust is in motion
Term | Definition |
---|---|
stress | A force acting on rock to change its shape or volume. |
shearing | Stress that pushes masses of rock in opposite directions |
compression | Stress that squeezes rock until it folds or breaks |
tension | Stress that stretches rock so that it becomes thinner in the middle. |
deformation | Stress that stretches rock so that it becomes thinner in the middle. |
fault | a break in Earth's crust where slabs of rock slip past each other. |
strike-slip fault | A fault where rocks on either side move past each other sideways with little up-or-down motion. |
normal fault | A fault where the hanging wall slides downward; caused by tension in the crust. |
hanging wall | The block of rock that lies above a fault line. |
footwall | The block of rock that lies below the fault line. |
reverse fault | A type of fault where the hanging wall slides upward. |
anticline | An upward fold in rock formed by compression of Earth’s crust. |
fold | A bend in rock that forms where part of Earth’s crust is compressed. |
syncline | A downward fold in rock formed by compression in Earth’s crust. |
plateau | A large area of flat land elevated high above sea level. |
earthquake | a break in the plates |