Earth

What substance, added to fog, makes smog?

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What is the only continent on Earth that does not have snakes?
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How much salt is in every gallon of seawater?
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What type of gem is the Star of Africa or the Cullinar II?
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What is the name of a representation of the Earth on a piece of paper?
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What substance can layers of decayed plants form over time?
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What happens to the pressure of water as depth under the water increases?
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What does a pluviometer measure?
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Which is another name for a pudding stone?
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