Geography
Give a geographical reason for each of the following:
(i) The sunrise and sunset occur at different times at different places.
(ii) The earth is not a perfect sphere.
(iii) Venus is hotter than Mercury.
Planet Earth
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Answer
(i) The sunrise and sunset occur at different times at different places because the earth rotates from west to east and therefore, people in the east can see the sun earlier than those in the west.
(ii) The earth is not a perfect sphere because the diameter of the earth varies at the equator and at the poles. This difference is due to the centrifugal force of the earth's rotation at a great speed which forms a bulge at the equator and a compression at the poles.
(iii) Venus is hotter than mercury because Venus is mainly composed of carbon dioxide which produces Greenhouse effect on the surface of Venus. Thus, the temperature on its surface remains very high.
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