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Man can maintain an ecological balance in the biosphere by:
Which one of the following is the highest cloud?
The soil which originate under tall-grass prairie vegetation is called:
Contours are imaginary lines showing:
In terms of size, Neptune ranks no. in our Solar System.
What is called a shallow stretch of river that may be crossed on feet.?
One of the following is not the result of underground water action:
Which planets do not have satellites revolving around them?
Evergreen type Forests are found in:
The approximate circumference of the Earth is