The tree species most commonly used in social forestry is
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June 21 marks the winter solstice in the _________ Hemisphere.
An _______________ is a sudden shaking or trembling of the earth.
Which is the closest star to our solar system?
Which of the following is the cleanest source of energy?
Study of earth is known as
The force of friction between two surfaces will increase if:
The given symbol stands for a/an ___ in an electric circuit.