An anticline is an upward arch-shaped fold. The oldest rock layers are found at the center., A syncline is a downward fold in rock layers formed by compressional forces, creating a trough or valley-like shape., A monocline is a step-like fold in which rock layers bend in one direction, usually caused by movement along an underlying fault., Forms when the Earth's crust is pulled apart (tensional force). One block of rock moves downward., Forms when the Earth's crust is compressed. One block of rock moves upward over the other., Forms when two blocks of rock slide horizontally past each other due to shear forces.

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