What is the primary cause of oceanic tides on Earth?
Answer and explanation
Correct answer: C. differential gravitational attraction exerted primarily by the Moon and secondarily by the Sun
- Step 1: Gravitational gradient forces from the Moon (and Sun) pull more strongly on water on the near side of Earth and least on the far side, creating tidal bulges. Answer: differential gravitational attraction exerted primarily by the Moon and secondarily by the Sun. Why not the others: Wind causes surface waves, not tidal cycles.
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