20.12: Earth's Energy- Challenge 2
- Page ID
- 6085
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- 1. Coal is a solid ___.
- hydrocarbon
- 2. Our dependence on fossil fuels is alarming because they are ___ and they emit ___.
- non-renewable; greenhouse gases
- 3. Natural gas is a ___ hydrocarbon.
- gaseous
- 4. Anthracite is a ___ rock.
- metamorphic
- 5. ___ is the highest quality type of coal, used primarily for residential and commercial space heating.
- Anthracite
- 6. Coal mining exposes the element ___, which reacts with air and water to form a highly corrosive chemical.
- sulfur
- 7. Crude oil must be ___ to be useful.
- refined
- 8. The Gulf of Mexico, Texas, and Alaska are major ___ in the U.S.
- oil-producing regions
- 9. Crude oil is a mixture of many different ___.
- hydrocarbons
- 10. ___ undergoes nuclear fission in a nuclear reactor.
- Uranium
- 11. To generate power, nuclear power plants ___, causing them to ___ and release energy.
- hit uranium atoms in fuel rods with tiny particles; split apart
- 12. Nuclear power is not completely clean because ___ and ___.
- uranium must be mined from the earth; radioactive wastes created by power nuclear fission cannot be safely disposed.