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Which one of the following planets has no moon?
If speed of rotation of the earth increases, the weight of the body:
Katrina is the name given to .
The rapidly growing mass of phytoplankton covering the surface water of a lake or pond is known as:
Smog is a combination of:
The area reserved for the welfare of wild life is called:
In a desert region, soil erosion can be checked by:
The pyramid of energy is .
Breaking down of rock in situ is known as:
Which is the coldest among the following?