I am a force of nature that rises and falls, yet I am not a living thing. What am I?

Category: Knowledge · Difficulty: expert

Hint: Think about what is influenced by the moon's gravity.

Answer

Ocean Tides

Explanation

Ocean tides are the rise and fall of sea levels caused by the gravitational forces exerted by the moon and sun.

This is a expert knowledge riddle — one of the harder riddles here. The answer is Ocean Tides.

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