Discussion
Earth's seasons are caused by which of the following?
Answer: A
The seasons are caused by the tilt of the earth's axis, about 23½° to the plane of its orbit, which stays pointed in the same direction as the earth goes round the sun.
Each hemisphere therefore leans towards the sun for half the year and away for the other half, changing both the angle of the sun's rays and the length of the day. Distance from the sun has nothing to do with it - the earth is in fact closest in January.
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