I mark the passing time, influenced by the Earth's spin and the Moon's embrace. What am I?

Category: Science · Difficulty: hard

Hint: I rise and fall, but I don't have hands.

Answer

Tides

Explanation

Tides are influenced by the gravitational forces of the moon and the sun, marking time in cycles.

This is a hard science riddle — a tricky one that takes a little thought. The answer is Tides.

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