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The day is longer on the earth by about 4 minutes because:
(a) the earth is round in shape (b) the earth rotates on its axis
(c) the earth revolves around the sun (d) the earth has atmosphere
(d) the earth has an atmosphere
Explanation
As the earth has an atmosphere, the light coming from the sun gets refracted due to the which, we can see the sun about two minutes before the actual sunrise and two minutes after the actual sunset. Hence, the time from sunrise to sunset is lengthened by about four minutes (two minutes because of advanced sunrise and two minutes because of delayed sunset).
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