9/11/13
12th Day of School
Learning Goal (7.E.1.1): I will be able to
describe the properties of Earth’s
atmosphere.
Due Today: 1st 3 PowerPoint slides
Evening Assignment: Work on atmosphere
properties slide of Powerpoint
In your composition notebook, copy
and answer the following…
What words would you use to
describe the properties of Earth’s
atmosphere?
Do Now
McDougall textbook, p. viii
Did you get it right?
What words would you use to describe
the properties of Earth’s atmosphere?
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•
•
•
Altitude
Density
Temperature
Air Pressure
Do Now
Why are these properties
important?
Look up and write down the definition in
your science notebook for the following
terms:
• Altitude
• Density
• Temperature
• Air Pressure
Defining key words
McDougall textbook, p. A11
What are the properties?
• Altitude: distance above sea level
• Density: the amount of mass in a given
volume of a substance
• Temperature: how hot or cold an object
is
• Air pressure: the force of
molecules pushing on an
area
Defining key words
McDougall textbook, p. A11
1. Living things use gases in the air:
• oxygen, nitrogen, argon, carbon dioxide, &
water vapor
2. The atmosphere keeps Earth warm.
• Transports energy to different regions of the
planet (radiation, conduction & convection).
3. The atmosphere protects & supports life.
4. Supplies materials that your body uses.
5. The atmosphere is held in place by gravity.
The Composition and Properties of the
Atmosphere make life on Earth possible.
Properties of Earth’s Atmosphere
Altitude and Density
• Air becomes thinner as altitude
increases. There is less oxygen.
• The thickness or thinness of air is
measured by density.
• The atmosphere’s density
decreases as you travel upward.
The air on a mountain is less
dense than the air at sea level. It
contains less mass.
• Most of the mass of the
atmosphere is close to Earth’s
surface.
McDougall textbook, p. A10
Properties of Earth’s Atmosphere
Temperature
• Changes with altitude
• Temperature is warmer at
sea level but decreases with
altitude in the mountains.
• Measured with a
thermometer.
http://eo.ucar.edu/webweather/basic5.html
• Air molecules move in
all directions, air
pressure pushes in all
directions.
• Air pressure decreases
with altitude.
• The air molecules in air
at sea level are denser
than air molecules in air
over a mountain.
• Air pressure is higher in
dense air than in thin air.
• Areas of high pressure
move to areas of low
pressure.
• Measured with a
barometer.
Air Pressure
http://eo.ucar.edu/webweather/basic5.html
Assignment: Earth’s Atmosphere Powerpoint
You will make a Powerpoint presentation about Earth’s
atmosphere. You may use information and pictures from class,
the textbook, other books, and the Internet but you MUST cite
your sources (ex. title, page, web address, etc). Include text in
your own words explaining any images you use. Your Powerpoint
should have the following slides. Final Powerpoint is due Friday
9/13/13.
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•
•
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Title slide with title, your name, period, date
Slide defining atmosphere
Slide(s) about the composition of Earth’s atmosphere
Slide(s) about the properties of Earth’s atmosphere
Slide(s) about the structure of Earth’s atmosphere
Major Assessment
Work on Title, atmosphere definition,
Earth’s atmosphere’s composition and
properties slides.
Evening Assignment