The process of electric discharge between clouds and the earth or between different clouds causes _____________.
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Which of the following was India's first interplanetary mission?
Which disease is caused by Nickel?
Atomic radius is measured in:
Sullage water is_______
Wheat is a ______.
What is the source of natural energy of the hot springs at Manikaran in Himachal Pradesh ?
Carbon dioxide is produced by all of the following except