Why in sand dunes is there no gravel or small pebbles? Only sand for miles? Wouldn’t there be small pebbles at least?

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Why in sand dunes is there no gravel or small pebbles? Only sand for miles? Wouldn’t there be small pebbles at least?

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Wind pushes the grains around. The heavy stuff doesnt move as well as the light stuff, so it gets left behind. The too light stuff gets blown away completely. What is left is sand, too heavy to fly away completely but light enough to move alot.