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by Melanie Ostopowich
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- juvenile literature (6)
- petrology (4)
- rocks (3)
- bodies of water (2)
- geochemical cycles (2)
- lakes (2)
- minerals (2)
- ocean (2)
- pollution (2)
- rivers (2)
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- children's questions and answers (1)
- pock cycle (1)
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