Crossword Genius

They're explained by Newton's law of universal gravitation

Ross

I believe the answer is:

tides

(Other definitions for tides that I've seen before include "Lunar ocean movements" , "Lunar-driven movements of oceans" , "Rises and falls, nautically" , "Periodic ebbs and flows of the sea" , "Sea movements caused by moon" .)

I've seen this clue in The New York Times.
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