Other Chapters' Lyrics:
Earth Science 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 -:- Life Science 1 - 2 - 3 - 3b - 4 - 4b - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 -:- Physical Science 3
Earth Science 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 -:- Life Science 1 - 2 - 3 - 3b - 4 - 4b - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 -:- Physical Science 3
Back to the full science song list. -:- Download free mp3 of this song. -:- Composer's home page.
_______________________________________________________________________________________
Earth Science
Chapter 5 - Summary Notes
á
A natural resource can be renewable or
nonrenewable. Renewable resources,
like trees, replace themselves quickly.
Nonrenewable resources, like coal, take thousands or million of years to
replace.
á
People use many resources faster than
the earth replaces them. Recycling
is a process that treats materials for reuse so that we donÕt have to gather as
many resources from nature.
á
All energy resources can be traced
back to the sun. The energy
resource we use the most are fossil fuels.
á
Fossil fuels are nonrenewable. They form from the remains of dead
organisms that are millions of years old.
á
Petroleum, or crude oil, is the liquid
fossil fuel we get gasoline from.
á
Gaseous fossil fuels are natural
gases. Natural gases power our
kitchen stoves.
á
Coal is a solid fossil fuel that comes
from buried, decomposed plant material.
Coal is also a rock.
á
We are always looking for alternative
energy sources because obtaining fossil fuels harms the environment. When coal is burned, sulfor dioxide is
released and combines with the moisture in the air to make acid rain (sulfuric
acid).
á
Nuclear energy is an alternative
source of energy that comes from splitting the nuclei of atoms. This process is called fission, and it
releases a lot of energy that is used to run electric generators in power
plants. The waste products are easy to contain, but it is hard to know where to
bury them.
á
Solar cells, like the ones on
calculators, get their energy directly from the sun. Solar energy does not pollute like many other energy
resources, but solar panels are very expensive to make.
á
Wind is another clean energy
source. However, wind turbines are
only effective in places where the wind is steady, such as California and north
Texas.
á
Hydroelectric energy uses the power of
falling water to make energy. Like
wind energy, hydroelectric energy cannot be harnessed everywhere. Dams built to harness this energy also
hurt the fish populations and other wildlife.
á
Underground water is hot enough in
some places to evaporate into steam.
Geothermal energy uses the steam from natural vents called geysers to
power electric generators.