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passive margin the continental margin near an area of lithospheric plate divergence active margin located in areas where oceanic lithosphere is being subducted beneath the leading edge of the continent fault-block mountains Forms when a normal faults uplift a block of rock. fold mountains mountains that form where two plates collide and force layers of rock into folds dome mountains Formed when magma collects and pushes the rock layers above it into a rounded-dome shape. strike slip fault break in rock caused by shear forces, where rocks move past each other without much vertical movement normal fault a type of fault where the hanging wall slides downward; caused by tension in the crust reverse fault a type of fault where the hanging wall slides upward; caused by compression in the crust thrust fault A geological fault in which the upper side appears to have been pushed upward by compression anticline an upward fold in rock formed by compression of Earth's crust syncline a downward fold in rock formed by compression in earth's crust fracture a crack in the earth's crust resulting from the displacement of one side with respect to the other horst and graben location of two normal faults that dip towards each other, horst is the ridge, graben is the valley