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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.

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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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