The holes get filled in

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ESP_033717_1990_1.0xA piece of Mars: Sand that moves into holes in the ground tends to get stuck there. That’s why this round hole ~150 m across, which was probably once a crater, is now brimming with sand and capped by ripples. (HiRISE ESP_033717_1990, NASA/JPL/Univ. of Arizona)

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