While some sand is formed in oceans from things like shells and rocks, most sand is made up of tiny bits of rock that came all the way from . . . MOUNTAINS!
But that trip can take THOUSANDS of years. Glaciers, wind, and flowing water help move the rocky bits along, with the tiny travelers getting smaller and smaller as they go. If they’re lucky, a river may give them a lift all the way to the coast. There, they can spend the rest of their years on the beach as SAND.
As for DESERTS, that dry land may have once been covered in water itself! Over time, changes in environments can make some bodies of water dry up, slowly transforming them into the deserts we see today.
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