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Old 06-12-2019, 09:29 PM
dtilque is offline
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Join Date: Jan 2000
Location: My own private Nogero
Posts: 6,980
Originally Posted by Sigene View Post
My point is that an "all flat sand" island would not likely be in deep ocean but rather in fairly shallow water.
You're right. An island as described in the puzzle will be somewhere near a large land mass. Out in the open ocean, wind and waves (especially storms) will wash such an island away. Near continents and large islands, waves wash the sand down the coast in one direction. That means they will bring about as much sand to the island as they take away, so such islands are stable. (This is ignoring man-made structures such as jetties, which interfere with the natural movement of sand.)