Erosion
a). is always a destructive process
b). builds river deltas and sand dunes
c). is the breakdown of rock and soil on earth's surface
d). happens more slowly in warm climate than in cold ones

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explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."