The diagrams below show how sand dunes are formed

The diagram illustrates the formation of

sand

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dunes

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carried out by the

wind

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.

It is clear that

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there are 3 main stages in

this

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process, starting with

sand

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particles being blown by the

wind

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and ending with the finished

sand

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dunes

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being formed in wet areas. As can be seen, during the first stage,

sand

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is blown by the

wind

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throughout the wet and dry places.

Next,

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it is kept moving by the force of the

wind

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,

however

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, there are more particles gathering on the wet ground than on the dry one, which creates some small piles.

Finally

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, those particles continue to tackle higher to make bigger piles and

this

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leads to the creation of

sand

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dunes

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like we usually see on the seaside.

Moreover

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, the height of the

dunes

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changes the direction of the

wind

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as it blows up on one side and down on the other side.

Then

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, the process repeats all over again to make new

sand

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dunes

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.