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The significant quantity of upper soil is formed by:
The Montreal Protocol 1987 refers to:
The layer of the atmosphere in which Radio Waves are reflected back is called:
Which of the following pair is INCORRECT?
Humus is a type of:
Which one is not a non-conventional energy source?
Which is the second nearest star to the Earth after the Sun?
Ox-bow lakes are formed when river is .
The total number of planets revolving around the sun is:
Soil formed by leaching and oxidation is: