MCQOPTIONS
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| 1. |
The variation in the duration of the day and the night is due to earth's _________________ |
| A. | revolution around the sun |
| B. | inclination of an angle of 60(1/2) degrees |
| C. | both (a) and (b) |
| D. | rotation on its axis |
| Answer» D. rotation on its axis | |