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GS Geography Physical Geography of World
Q.

When the moon completely covers the sun, it is known as:
Explanation:

ANS. (B) 
A solar eclipse occurs when the moon crosses the path between the sun and the earth. The darkest shadow (where the sun is completely covered) is called the umbra. The umbra is narrow at the distance of the Earth, and a total eclipse is observable only within the narrow strip of land or sea over which the umbra passes. The partial shadow is called the penumbra.

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