C. It decreases in wave speed.
<span>Period of a wave is the time needed for one complete cycle of vibration to pass a given point. Frequency and period have a reciprocal relationship. Frequency can be similarly thought of as speed of a wave.</span>
Explanation:
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Well, the south was more agriculture, and the north more industrial, leading to division.
Magma that cools below the earths surface forms Extrusive igneous rock
