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Science Earth & Space Week #6 Crossword Puzzle

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Across
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Wrote a book called "Silent Spring" in 1962
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An example of an inexhaustible resource
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Served under President Roosevelt and probably first used the word conservation for protecting natural resources
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A type of resource that can replace itself as it gets used
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A fancy word for oil
Down
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The practice of saving the Earth's resources and using them wisely
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The Earth is full of these useful things
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To use over and over again