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Widening of a river valley takes place due to:
The climate of North America is influenced during winter by the:
Consider the following geological phenomena:
I. Development of a fault
II. Movement along a fault
III. Impact produced by a volcanic eruption
IV. Folding of rocks
Which of the above causes earth-quakes?
‘Flash floods’ are associated with:
Which is the warmest layer of the atmosphere?
5. The light from the Sun reaches the Earth in about—
Approximately what is the normal rate of temperature rise with depth from the surface of the Earth to the interior of the Earth?
Density of the earth’s atmosphere is highest in the:
Name the condition which influences the development of plants into distinctive forms.
Who had used the term “Ecology” first time?