Transcript 14.7 The Sun - An Important Star

The Sun: An Important Star
14.7
The Sun’s Affects on the Earth
The Sun is the only star in our solar
system.
It gives the energy needed by all the
Earth’s plants and animals.
Its gravitational pull keeps us in our
steady orbit.
1. No life could exist on any planet in
our solar system without the
energy provided by the Sun.
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At night, the temperature drops, the
light fades, and other objects
become visible.
Because the Sun is the closest star
to the Earth, you cannot see other
stars until the Sun has set.
Where does the Sun’s Energy
come from?
The Sun produces energy through a
process called 2.Nuclear Fusion Hydrogen nuclei fuse to form helium
nuclei.
Inside the Sun the temperature and
pressure are so high that substances
fuse and form new substances.
3.When the substances fuse together it
produces large amounts of heat, light,
and other energy that travel from the
Sun into space.
Nuclear Fusion
Hydrogen nuclei fuse to form helium
nuclei. This process produces large
amounts of heat, light, and other energy
that travels from the Sun into space.
4.The
Sun is about 75% hydrogen and 25%
helium.
paragraphs 3-4
Nuclear Power
(Point Lepreau in St. John)
5. Nuclear
power plants do this to create energy
for homes, but on a much smaller scale. They
use tiny amounts of a metal called uranium to
start a nuclear reaction.
The reaction releases heat, which is used to
make steam.
Nuclear power plants don’t pollute the air, but
their waste is very dangerous.
A nuclear accident can poison a large area for
thousands of years.
Activity
 On a blank sheet of paper draw a
picture similar to Figure 3 on p.453.
 It should look like a “Black Line Master”
drawing, making sure the lines for the
labels are all lined up and neat.
 Label all the parts of your drawing.
Fig. 3
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P. 453 Questions
# 1, 2 & 7