How deserts are formed?

How deserts are formed? :

On the day of creation, the whole world was one huge garden of flowers. The Lord, however, called man to him and gave him this warning:

'Beware, every time you do something wrong a grain of sand will fall on the earth.'

But mankind paid no attention at all to this warning.

“What harm could a few grains of sand do?”

They continued to do wicked things and thus, little by little, the world has been invaded by rivers and the seas of sands which form the great deserts.

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