Which of the following is the most abundant metal on Earth's crust?
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Which of the following fuels causes minimum environmental pollution?
Which among the following is not an inner planet?
The largest dolphin species is the orca, also called as ________.
The _________ keeps the average temperature of the Earth fairly steady.
__________ is the number of individuals of the population who left the habitat and gone elsewhere during the time period under consideration.
Land covers about ______ of the earth's surface.
Which of the following metals is stored in kerosene oil?