World Geography
The thickness of biosphere is

5-8 km above the earth's surface
5-10 km above the earth's surface
10-12 km above the earth's surface
8-10 km above the earth's surface

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World Geography
The Penumbra is

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

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