If the earth is flat, what causes the tides?
If the moon is strong enough to lift trillions of gallons of water, why cant it lift the hairs on head?
If the earth is flat, what causes the tides?
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Fish swimming to get away from the cats trying to either eat them or push them over the edge ...
The earth is flat but rests on an iron blob that causes earth to wobble around, sloshing the oceans to create tides, which are then package in little bite-sized bags for kids to swallow.
As to the question of why other planets are round, they aren’t. What looks to be rotation is the surface sliding around on tectonic plates.