Chemistry
Which one of the following is not a cause for present global warming and climate change ?

Methane emission
Deforstation
CFC emission
Carbondioxide emission

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Chemistry
Water cycle refers to

Water distribution in relatively dry areas
An integrated attempt to recycle water in relatively arid regions
Scientific management of water in areas excessively plagued with water-logging
Constant movement of water from ocean to land and back to ocean once again

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