I think it's due to the difference between our gravity and the Moon's, which creates the tidal flow, and set's limits to it. Except in the case of hurricanes, storms and earthquakes. There is no tidal flow on rock or solid ground so inland lakes are not affected. We think the giant water planet has constant tidal waves, as it has no other source of external gravity acting on it like a comparable moon. Which negates my theorem as why would it have constant waves. Perhaps it doesn't.
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