1. Fossil Fuels

2. 25) Electricity is considered a
secondary source of energy because
it takes other sources of energy, such
as coal or solar to create electricity.

3. 26) Currently,
most
electricity is
generated
through
nonrenewabl
e energy
sources.

5. 27) Most electricity in the U.S.A. is
generated by coal burning power
plants because it is the cheapest to
use and produces large amounts of
energy.

6. 28) The three types of fossil fuels
are coal, oil, and natural gas.

7. 29) Fossil fuels are the most
commonly used nonrenewable
resources.

8. 30)The energy in fossil fuels
originally came from the sun.

9. 31) The sun provides energy to
plants and the plants use
photosynthesis to help them grow.

10. 32) The ultimate source of the energy in
fossil fuels is from the sun.
Photosynthetic plants and marine algae
lock this energy into organic matter.
When we burn plants, coal, oil, or gas,
we release the sun's trapped energy.

11. 33) Burning fossil fuels releases
their stored energy.

12. 34) Three problems with burning
fossil fuels are air pollution, water
pollution, and soil pollution.

13. 35)Carbon dioxide is released when
burning fossil fuels.

14. 36) Coal is an organic rock that
originally came from dead swamp
grass that compacted over millions
of years.

15. 37) The fossil fuel coal formed from
the remains of plants that lived and
died around 100 to 400 million years
ago, when parts of the earth were
covered with huge swampy forests.

16. 38) Coal is considered a
nonrenewable energy source
because it takes millions of years to
form.

17. 39) Of the fossil fuels, natural gas
produces the least amount of
pollution.

18. 40) Natural gas is a naturally
occurring hydrocarbon gas mixture
consisting primarily of methane, with
other hydrocarbons, carbon dioxide,
nitrogen and hydrogen sulfide.

19. 41) Natural gas is an energy source
often used for heating, cooking, and
electricity generation.

20. 42) Petroleum oil is a nonrenewable
fossil fuel usually found
underground in reservoirs located in
sandstone or limestone. This fossil
fuel is made from sea plants and
animals.

21. 43) The energy source used more
than any other in the U.S.A. is oil.

22. 44) Gasoline is made from the fossil
fuel oil.

23. 45) Oil and gas are formed from the
remains of marine plants, animals and
microorganisms that lived in seas
millions of years ago.

24. 46) Propane is a nonrenewable
fossil fuel that is a derivative of
natural gas and petroleum

25. 47) When
present
supplies of
nonrenewable
resources are
used up, there
will be no
more.