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Earth Resources C25-2

Lorna J.

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Across
3.A natural resource that can be mined at a profit.
4.In arid and semi-arid areas of the world, the loss of topsoil.
6.A mixture of gravel, sand, and crushed stone that naturally accumulates on or close to Earth's surface.
7.The resources that Earth provides.
9.Natural resources that it is possible to use indefinitely without causing a reduction in the available supply.
10.Substances that can adversely affect the survival, health, or activities of organisms.
11.When salt water is distilled.
Down
1.A resource that exists in a fixed amount in various places in Earth's crust and can be replaced only by geological, physical, and chemical processes that take hundreds of millions of years.
2.The material left after the ore is extracted.
5.The replacement of renewable resources at the same rate at which they are consumed.
6.When pollutants in air occur in quantities that become harmful to human health and the health of the environment.
8.Deeper soil layer that lies on a base of unweathered parent rock.

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