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Earth Resources - C252 - 2

Lauren C

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Across
8.substances that can adversely affect the survival, health or activities of organisms
10.natural resources that can be used indefinitely without causing a reduction in the available supply
12.material left after ore is extracted
Down
1.exists in a fixed amount in various places in earths crust and can be replaces only by geological, physical, and chemical processes that takes hundreds of millions of years
2.mixture of gravel, sand, and crushed stone that naturally accumulates on or close to Earths surface
3.replacement of renewable resources at the same rate at which they are consumed
4.pollutants in air, they become harmful to human health and environment
5.process whereby productive land becomes dirt
6.resources that earth provides
7.occurs when salt water is distilled
9.unweathered parent rock
11.natural resource that can be mined at a profit

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