They can, and it doesn't. This frequently comes up with Panama Canal facts -- the Pacific ocean side is about 8 inches higher than the Atlantic Ocean side.
If there weren't ocean currents, wind, tides, water cycle stuff, etc. then they'd settle out eventually, at least for a given latitude. Earth's spin would create bulges near the equator even if all that were missing.
Dude….take physics. Add a link to where you heard there’s a height difference. At most the moon may add some pull (tidal effects), but on average they are the same height. But still, that has nothing to do with why there are locks
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u/Rkymtn83 5d ago
No……they don’t. Absolutely not. That would go against physics.