The lowest layer of atmosphere is called _______.
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Formula for distance is
Sextant is an instrument used in which of the following ?
The web uses the __________ to request and serve web pages and programs.
Gateway of India was built by
What process takes place during the youthful stage of a river?
If tan(A/2) = x, then the value of x is
Dodecahedron has 20 vertices. How many edges does it have?