Which of the following is not a type of mass movement that results from the force of gravity?
a creep
b mudflow
c landslide
d deflation

I think the correct answer from the choices listed above is option D. Deflation is not a  type of mass movement that results from the force of gravity. Deflation occurs when a pressurized substance most often a gas returns to a state of non pressurization. Hope this answers the question. 

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