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By wind, Wales

Sand dune formation Wind picks up and transports grains of sand by saltation, where sand grains bounce along the ground. If you stand on a windy beach, you can feel them stinging your ankles!

When the wind speed drops a little, sand stops being moved and is deposited, often building up dunes like the ones shown below.

Sometimes, sand dunes gradually move down-wind as sand is blown up the dune and over the crest It is then deposited where there is shelter from the wind - shown in the diagram.

Sand dunes, near Borth, Wales

Sand dunes near Borth, Wales
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