MediumScience
"I am the sea breathing in and out twice a day. I am controlled by something a quarter of a million miles away. Sailors fear me and fishermen live by me. What am I?"
Answer
The Tides
Explanation
Tides are caused by the gravitational pull of the Moon — 238,855 miles from Earth — and to a lesser extent the Sun. Most coastal locations experience two high tides and two low tides every 24 hours.
This is a medium riddle in the Science category — Riddles about physics, space, biology and the laws of the universe.
Tags:natureoceanscience
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