Chemistry
What are the components responsible for acid rain?

Sulphur dioxide (SO2) and Nitrogen oxides (NOx)
Nitrogen monoxide (NO) and Carbon monoxide (CO)
Oxides of carbon (COx) and Oxides of nitrogen (NOx)
Carbon dioxide (CO2) and Carbon monoxide (CO)

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Chemistry
Water cycle refers to

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

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