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Science Earth & Space Week #6 Crossword Puzzle

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