World Geography
The thickness of biosphere is

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

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World Geography
The period of daylight

All of these
is nearly constant near the equator
reaches a maximum of 24 hour in the polar zones in summer
varies with latitude and the season

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