21.6: Earth's Materials- Challenge 1
- Page ID
- 6121
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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.
- renewable
- 4. ___ resources cannot be replenished fast enough to keep up with human use.
- Non-renewable
- 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.
- quarry
- 10. Valuable minerals found in stream gravels are called ___.
- placers
- 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.
- 400