Earth

Approximately what fraction of the Earth's air is made up of oxygen?

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What mineral makes both sapphires and rubies when cut and polished?
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Which season does the part of Earth tilted towards the sun experience?
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Where is the foggiest place in the world?
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How are pockets of air in soil made?
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What does the Saffir-Simpson scale measure?
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The coldest recorded temperature on Earth, -128 degrees F., was taken where?
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What basic cloud formation resembles cauliflower?
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From which does the Global Positioning System receive its information?
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