Chemistry
Which one of the following statement is correct ?Ozone is found in the earth's atmosphere mostly between

10 and 20 km
5 and 10 km
50 and 100 km
20 and 50 km

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Chemistry
Water cycle refers to

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

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