Modified True/False
Indicate
whether the statement is true or false. If false, change the identified word or phrase to make the
statement true.
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1
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Earth’s weather is the thin layer of gases that surrounds Earth.
_________________________
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2
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Dry air is 78% nitrogen and 21% carbon dioxide.
_________________________
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3
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Burning fossil fuels causes more pollution than soil erosion, dust
storms, and forest fires together. _________________________
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4
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Factories produce less air pollution than motor vehicles.
_________________________
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5
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Nitrogen oxides react with other air pollutants in the presence of sunlight to
form acid rain. _________________________
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6
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The density of a fixed volume of air increases as its mass increases.
_________________________
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7
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As air pressure increases, the column of mercury in a barometer rises.
_________________________
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8
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As altitude decreases, the density of the air decreases.
_________________________
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9
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People live in the thermosphere, or inner layer of the atmosphere.
_________________________
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10
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In the outer mesosphere, temperatures approach –90ºC.
_________________________
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Completion
Complete each
statement.
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11
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The condition of Earth’s atmosphere at a particular time and place is
known as ____________________.
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12
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Because the atmosphere traps solar energy, water exists in ____________________
form on Earth for living things to use.
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13
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The name of the molecule that is made up of three oxygen atoms is
____________________.
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14
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The atmospheric gas called ____________________ forms clouds when it
condenses.
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15
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The gas that is found in the greatest amount in the atmosphere is
____________________.
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16
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Harmful particles and gases in the air are known as air
____________________.
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17
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The human activity that causes the most air pollution is the burning of
____________________.
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18
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One result of air pollution is ____________________, which is precipitation that
contains more acid than normal.
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19
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Acid rain can form when ____________________ in the air mixes with sulfur oxides
to form sulfuric acid.
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20
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The weight of a column of air pushing on an object causes
____________________.
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21
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The ____________________ of air can be calculated if the mass and volume of air
are known.
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22
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Because air has mass, it exerts a force per unit area called
____________________.
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23
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A(n) ____________________ barometer measures air pressure by using a metal
chamber that is sensitive to pressure changes.
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24
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The space above the mercury in the glass tube of a mercury barometer is almost a
____________________.
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25
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On a mountaintop, a person becomes out of breath quickly because fewer
____________________ molecules are present per cubic meter of air.
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26
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The ____________________ of a mountaintop is its distance above sea
level.
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27
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Animals produce the atmospheric gas _________________________, which plants need
to live.
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28
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Satellites orbit in the part of the thermosphere called the
____________________.
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29
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In the part of the atmosphere called the ____________________, solar particles
hit atoms and cause them to glow.
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30
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The ____________________ extends from the top of the troposphere to the bottom
of the mesosphere.
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Essay
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31
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Describe three ways that the atmosphere helps living things survive on
Earth.
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32
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Explain why military aircraft pilots must wear masks that provide oxygen when
flying at high altitudes.
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33
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Describe four ways in which natural processes add harmful particles to the
air.
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