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Chapter 1, 1-3 Test Review
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What gas makes up 21% of air?
oxygen
What percent of the air is nitrogen?
78%
The mesosphere is the layer of the atmosphere that protects Earth's surface from being hit by most __________.
meteoroids
On a mountain top, a person becomes out of breath quickly because fewer _________ molecules are present per cubic meter of air.
oxygen
The __________, or elevation, of a mountaintop is its distance above sea level.
altitude
Because air has mass, it exterts a force called:
air pressure
Water in the form of gas is called:
water vapor
Where does the mesosphere occur in Earth's atmosphere?
between the stratosphere and the thermosphere
As you move from the troposphere to the stratosphere in Earth's atmosphere what happens to air pressure and density?
air pressure decreases and density decreases.
Name three properties of air.
pressure, density, mass, volume, pressure, temperature
What changes in air pressure would you expect if you carried a barometer down a mine shaft?
Air pressure would increase because the amount of air above you increases.
What is altitude?
The distance above sea level
What are the four most common gases in air?
Nitrogen, Oxygen, carbon dioxide, and argon
The ___________ is the envelope of ___________ that surrounds Earth.
atmosphere; gases
Which layer of the atmosphere's four main layers contains both the ionosphere and exosphere?
The thermosphere
How does the temperature of the air change as you go higher in the troposphere?
It decreses
Which layer of the atmosphere protects the Earth's surface from being hit by most meteoroids?
mesosphere
The layer of the atmosphere between the stratosphere and the thermosphere is called the
mesosphere
The ozone layer protects living things on Earth from
ultraviolet radiation
The lowest and shallowest layer of the atmosphere is the
troposphere
Ozone is
a form of oxygen with three oxygen atoms in each molecule
The layer of our atmosphere in which weather occurs is the
troposphere
From earth to space, the main layers in our atmosphere are:
troposphere, stratosphere, mesosphere, thermosphere
The layers of the atmosphere are classified according to changes in
temperature
As you rise upwards in the atmosphere, air pressure
decreases
Instruments used to measure air pressure are called...
barometers
What percent of our atmosphere is made up of gases other than oxygen and nitrogen?
1%


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