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Inside Earth 2:1
Ch 2:1 Earth's Crust in Motion
Question | Answer |
---|---|
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 | A change in the volume or shape of Earth’s crust. |
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. |
Fault-block mountain | A mountain that forms where a normal fault uplifts a block of rock. |
Fold | A bend in rock that forms where part of Earth’s crust is compressed. |
anticline | An upward fold in rock formed by compression of Earth’s crust. |
Syncline | A downward fold in rock formed by compression in Earths crust. |
Plateau | A large area of flat land elevated high above the sea level. |