World Geography
The Penumbra is

None of these
both (a) and (b)
formed by the tangent that intersects between the sun and the moon
the outer portion of the moon's shadow

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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:

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

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