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Ozone layer is formed due to reactions of:
The main source of usable water on the Earth is:
Approximately what is the normal rate of temperature rise with depth from the surface of the Earth to the interior of the Earth?
Which one of the following is the highest cloud?
Which among the followings is not the result of underground water action?
Trade winds blow from the:
Natural sources of air pollution are:
Most of the devastating earthquakes are usually caused by:
Equinox occurs when the sun is vertically above-
Mounds of sand formed by wind action are called: