___________ is the process of restoring a forest that once existed but was removed at some point of time in the past.
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Mercury is the _______ planet from the Sun.
Which of the following gas contributes the maximum to the phenomena of global warming?
Which of the following is not a commercial source of energy?
What is the position of the Earth when it is at the greatest distance from the sun ?
The space shuttle which took Sunita Williams beyond earth was
The phenomena of raising the outer edge of the curved roads above the inner edge to provide necessary centripetal force to the vehicles to take a safe turn is called _____.
What is the sound made by seal called?