A(n) muscle action occurs when a muscle is exerting force greater than the resistive force, resulting in shortening of the muscle nasm

The answer would be a concentric muscle action. It appens when a muscle exerts a force that is greater that the resistive force which then results to the shortening of the muscle. It is alternatively known as concentric contractions. The force produced by the muscle is always less than the maximum.

Humans can affect weathering and erosion in several ways.  humans cause  increases in acid rain and pollution, which increase the amount of  weathering  agents in the air and water, and then on land.for an easy answer: 1) acid rain2) pollution

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