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Environmental Problems, Their Causes, and Sustainability - page 25 / 41

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Non-Renewable Resources Exist only in fixed quantities on earth.

Energy Resources: such as coal, oil and natural gas.

Metallic Resources:

such as iron, copper, aluminum

Non-Metallic Resources:

Such as salt, clay, sand

Economic Depletion

Fig. 1-8 p. 11

When 80% is gone it may be too costly to get the last 20%.

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