Which of the following three R's are regarded as environment friendly?
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Which of the following is the most abundant metal on Earth's crust?
Which is the coldest planet?
Chlorophyll was first isolated and named by
______ is the time taken by the earth to return to a given point in its orbit with reference to a fixed star.
An _______________ is a sudden shaking or trembling of the earth.
Which of the following fuels causes minimum environmental pollution?
How many days moon takes to revolve around the earth?
The Moon takes about 27.3 days to perform one complete orbit around the Earth.
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