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How salty is sea water?
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Evolution
How many oceans are there?
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Evolution
What is the difference between an ocean and a sea?
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Evolution
How does the boiling point of water help determine altitude?
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Evolution
What is the highest waterfall in the world?
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Evolution
What waterfall has the largest flow of water?
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Evolution
How is water used in the home?
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Evolution
How much does a gallon of water weigh?
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Evolution
