Answers

2016-02-09T20:55:10+05:30
Earth is slightly  tilted. And 8t has a tilt of 23.5 degrees. This is one reason  wnd other is the rotation and revolution  of the earth.
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2016-02-11T19:33:27+05:30
We have seasons because the earth is tilted as it makes its yearly journey around sun.
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