Geography
The amount of oxygen in earth's atmosphere is
- 60%
- 21%
- 78%
- 10%
Planet Earth
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Answer
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Give reasons for the following:
The earth is the home of humankind.
Earth's orbit lies between
- Venus and Mars
- Mercury and Venus
- Mars and Jupiter
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Earth's biosphere is also called
- ecosystem
- environment
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The average distance of earth from the sun is
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- 108 million km
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