Which of the following is a wind-blown large pile of sand? a) erg b) desert c) erosion d) desert varnish

The answer is erg. It is a broad, flat area of desert covered with wind swept sand with little or no vegetable cover (large accumulation of sand).. It is formed by the action of winds. Sand dunes can migrate and increase their number in certain areas over many thousand of year. Large regions of sand were originally formed when the land was covered by shallow sea. The action of waves over a very long period of time can erode rocks to form sand.

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