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Question
Which of the following refers to the white salt which covers the land in some areas during dry season?
Options:
A .  erg
B .  usar
C .  reg
D .  reh
Answer: Option D
Answer: (d)Reh refers to a mixture of soluble sodium salts appearing as efflorescence on the ground in arid or semiarid regions in India. It covers the land in the form of a white layer. It is also known as Kallar.

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