Mass movement is caused by a. plucking and abrasion. b. gravity. c. chemical weathering. d. erosion and deposition.

b. Gravity, defined as the large movement of rock, soil and debris downward due to the force of gravity

Gravity can cause erosion and deposition. Gravity makes water and ice move. It also causes rock, soil, snow, or other material to move downhill in a process called mass movement.

The answer is Gravity

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i believe the answer would be b. hope it : )

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.