Which of the statements given about desertification are correct? I. Conversion of former moist ...

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Which of the statements given about desertification are correct?

I. Conversion of former moist and fertile land into arid desert area.
II. It is a product of soil erosion.
III. Desertified area can be put to any use.
(a) I and II
(b) I and III
(c) II and III
(d) I, II and III
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