The diagrams below show one way in which sand dunes' are formed. Summarise the information by selecting and reporting the main features, and male comparisons where relevant.

The following diagrams illustrate the formation of a

sand

dune from

sand

particles

.

Overall

, the entire three stages of generation reveal that

sand

particles

are indeed propelled by the

wind

over

dry

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the dry

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ground

in order to

further

gather on

wet

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the wet

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ground

which in turn causes them to congregate and produce

sand

dunes The first diagram displays the process of how

sand

particles

are blown by the

wind

over

a

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dry and sandy

ground

as well as

a pair of wet

ground

.

This

is frequently followed by the second diagram where it is

bserved

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observed

that as time passes,

particles

continue to be moved by the

wind

along the

ground

. A portion of these

particles

begin

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begins

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to stick to the initial patch of wet

ground

in distinct independent piles. The final diagram which illustrates the

sand

particles

that have been shifted by the

wind

, eventually gather in masses over an area of wet

ground

. These masses pile on top of one another until it forms a

sand

dune. These accumulated

sand

particles

are so immense in size,

once

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that once

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formed possess the ability to deter

wind

and force it up along

on

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one

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side of the

sand

dune and down the other. During

this

process,

particles

of

sand

begin to gather and occupy the next available area of wet

ground

.