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21.6: Earth's Materials- Challenge 1

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    1. Paper can be made mostly or entirely from ___.
    renewable resources
    2. Electronics need specific materials known as ___.
    rare earth elements
    3. A ___ resource is unlimited or replenished as quickly as it is used.
    4. ___ resources cannot be replenished fast enough to keep up with human use.
    5. ___ form over millions of years from the remains of dead organisms and are mainly comprised of ___.
    Fossil fuels; carbon
    6. Regions where hot fluids came off a magma intrusion often have ___.
    copper deposits
    7. A mineral deposit that is profitable is called an ___.
    ore deposit
    8. Geologists determine the size of the deposit, test the concentration of ore in rock samples, and estimate the total amount of minerals in a ___.
    mineral deposit
    9. A ___ is a type of open-pit mine where rocks and minerals used to make buildings and roads are extracted.
    10. Valuable minerals found in stream gravels are called ___.
    11. Panning for gold in streams works because ___.
    gold sinks to the bottom of the pan
    12. After ore is extracted from a mine, valuable minerals must be separated from ___.
    waste rock
    13. Around the world, humans use over ___ aluminum cans each year.
    80 billion
    14. To save ten gallons of gasoline that would otherwise be used to produce new aluminum cans, ___ used aluminum cans must be recycled.

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