| Hint | Answer |
|---|
| can harm the environment in a number of ways | |
| can be blown or deposited elsewhere by wind or water erosion | |
| when rainwater seeping through a mine or mine wastes carries sulfuric acid to nearby streams and groundwater | |
| contains desired metal | |
| waste material | |
| removing the gangue from ores produces piles of wastes called | |
| used to separate metal from other elements in ore material | |
| percentage of metal content | |
| | Hint | Answer |
|---|
| cheap enough to allow mining companies to level entire mountains containing low-grade gold ore | |
| including the cost of environmental harm done in the price of goods made from minerals | |
| when a mineral costs more to find, extract, transport and process the remaining deposit than it is worth | |
| how long it takes to use up a certain proportion of the reserves of a mineral at a given rate of use | |
| the usable amount of high-quality energy available from a given quantity of a resource | |
| inexhaustible solar energy | |
| 84% of the commercial energy consumed in the world comes from ____________ energy sources | |
|
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