(B) State the reason.
1) The atmosphere satisfies the need of natural shield for the earth.
2) The oceans are very useful.
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1. Suppose a new planet is discovered beiween Mars and Jupiter. Its time period of revolution will be a) less than that of Mars. b) less than that of Mars or more than that of Jupiter. c) more than that of Mars but less than that of Jupiter. d) equal to that of Jupiter.
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