Ocean tides are caused by the gravitation of the Moon. Currents can be
formed by the flow of tidal water around the continental plates, or by a
difference in water temperature between large ocean areas. Surface
waves are caused by the wind. Abnormal waves can be created by the
tectonic movement of plates around and under the ocean floor (tsunamis).
So as you can see, the answer is (C) Gravity
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Definition. The hypothesis accepted to be true if the null hypothesis is rejected based on statistical evidence. Supplement. In the statistical testing of hypothesis, the two rival hypotheses are the null hypothesis and the alternative hypothesis.
Rays of light that pass through the lens are brought closer together that’s because this lens is a converging lens.
The answer is Observation. That's the first step.