52.The diagram below shows the way in which sand dunes are formed. Summarize the information by selecting and reporting the main features, and make comparisons where relevant

The graphic illustrates how

sand

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dunes are created.

Overall

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, it is a mainly 3 stage, natural process. It important things in the process are

wind

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,

sand

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particles

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, wet

sand

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and dry

ground

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. First of all, the

sand

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particles

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are blown by the

wind

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over the dry sandy

ground

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and two areas of wet

sand

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.

This

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is

then

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followed by the second diagram in which it can be seen that as

particles

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of

sand

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continue to be carried by the

wind

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along the

ground

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, some

particles

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start to adhere to the first and the second wet

ground

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in separate piles. The

sand

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particles

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which have been transported by the

wind

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, as illustrated in the final diagram, eventually gather en masse over the area of wet

sand

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, piling one on top of the other until they form a

sand

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dune. The accumulation of so many

sand

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particles

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is so large that the dunes, once formed, can deflect the

wind

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, forcing it up one side of the dune and down the other. As

this

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happens,

particles

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of

sand

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start gathering and piling up in the next area of wet

ground

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.