Earth
Approximately what fraction of the Earth's air is made up of oxygen?
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Which material do fossils make more attractive to an architect?
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What event happened when water droplets were on a spider's web but it hadn't rained?
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What device measures the speed or force of the wind?
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What is the term for the Earth's crust where it underlies oceans?
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What magnitude did the largest recorded earthquake in the United States reach?
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The science term "weather vane" is best defined as which of these?
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