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8 Cards in this Set
- Front
- Back
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Mineral |
a naturally occurring, usually inorganic solid that has a characteristic chemical composition. |
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Ore mineral |
Minerals that are valuable and economical |
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Subsurface mining |
Ore deposits are found 50 or more meters below earth's surface |
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Surface mining |
Ore deposits that are found on or close to Earth's surface |
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Placer deposits |
minerals are concentrated by wind and water into surface deposits |
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Smelting |
crushed ore is melted in high temperatures in furnaces to sepearate impurities |
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Subsidence |
the sinking of regions of the ground with little or horizontal movement |
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Reclamation |
the process of returning land to it's original state |
