The diagrams below show how sand dunes are formed.

The diagram depicts the formation of

sand

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dunes

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from

sand

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particles

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.

Overall

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, the process comprises three main steps that begin when

sand

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particles

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are blown by

wind

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from dry to wet

ground

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and end when

sand

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dunes

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are formed on wet

ground

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. At the beginning of the process, the

ground

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, which consists of mainly dry sandy

ground

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and two small areas of wet

ground

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created by rains or other types of precipitation, is filled with separate

sand

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particles

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. These

sand

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grains are continuously carried by the

wind

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to wet

ground

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. When

sand

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particles

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come into contact with wet areas, water, in

this

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case acting as

natural

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a natural

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adhesive, will adhere to the

sands

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sand

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particles

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.

Then

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,

sand

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particles

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can pile up

on to

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onto

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each other;

therefore

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, facilitating the accumulation of

sand

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grains. These

accumuation

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accumulation

accumulations

of wet

sand

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particles

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gradually increase in size until

sand

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dunes

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are ultimately created. Once the

sand

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dunes

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reach a certain height, they can deflect the

wind

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direction, changing the

wind

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to blow downward on one side and upward on the other. The changes in

wind

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direction constitute a cyclical process when

sand

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particles

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after repetitively being driven by

wind

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assemble on other wet areas, forming successive

sand

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dunes

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.