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Why do estimates of mineral reserves change? Choose one or more: A. Reserves change as resources become contaminated and unusable. B. Reserves change as resources
Why do estimates of mineral reserves change? Choose one or more: A. Reserves change as resources become contaminated and unusable. B. Reserves change as resources are depleted. C. Reserves change as prices rise, making advances in mining worth the cost. D. Reserves change when more minerals are formed and scientists recalculate the resource. E. Reserves change when previously unknown resources are discovered
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