World Geography
Who was first to measure the circumference of Earth?

Eratosthenes
Anaximander
Herodotus
Aristotle

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World Geography
Which among the following statements is/are correct about the symbiotic life of Corals?Algae gives carbon dioxide and other substances the  coral polyp needs.Coral polyp gives off oxygen and other nutrients that the algae needs.Select the correct code from the options given below:

Only 1
Both 1 & 2
Neither 1 & 2
Only 2

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World Geography
Which among the following statements is not correct about Plunge pool?

They are often very deep, generally related to the height of fall and the volume of water,
It is created by the erosional forces of cascading water
It is a deep depression in a stream bed at the base of a waterfall
They occur at the mature stage of the river development

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