Dec. 21, 2017, 2:21 a.m.

Where Does the Sand Come From?

This image from NASA's Mars Reconnaisance Orbiter (MRO) shows one possible place where sand grains are being produced on Mars today.

Where Does the Sand Come From?

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Robot
Jan. 21, 2018, 12:38 p.m.
If sand grains get destroyed over time, will earth beaches disapear? At least those far away from sand sources?
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