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Unit 3 Air

True/False
Indicate whether the statement is true or false.
 

 1. 

Sea level is defined as having an elevation of 100, and all other elevations are measured in terms of the height “above sea level.”
 

 2. 

The troposphere is the region of the atmosphere in which temperatures rise as the distance from the surface increases.
 

 3. 

The atmosphere holds a tremendous amount of water in the form of water vapor, water droplets, and ice crystals.
 

 4. 

The Earth’s atmosphere is about 39 percent nitrogen and oxygen.
 

 5. 

Scientists believe that the increase in greenhouse gases contributes to global warming.
 

 6. 

As a liquid, CO2 sold in steel drums and tankers is most commonly used as an ingredient in soft drinks, where it produces the “fizz.”
 

 7. 

Carbon monoxide (CO) is a colorless, odorless, and tasteless gas that will burn (producing CO2).
 

 8. 

In the atmosphere, the naturally occurring CO level is about 0.2 ppm, which is not harmful to humans.
 

 9. 

In high concentrations, CO is highly toxic to animals, including humans.
 

 10. 

Volcanic eruptions and the incomplete natural burning of forests, bushes, and grasses produce CO gas.
 

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

The atmosphere reaches from the Earth’s surface to a height of about ____ miles above sea level.
A.
243
C.
16
B.
348
D.
1,299
 

 2. 

Scientists divide the atmosphere into zones based on height above sea level. Which of the following is not a sea level zone?
A.
Troposphere
D.
Microsphere
B.
Stratosphere
E.
Mesosphere
C.
Thermosphere
 

 3. 

The ____ starts at the surface and extends upward to an average of about 4 miles over the poles and ranges up to 17 miles above sea level near the equator.
A.
exosphere
C.
troposphere
B.
thermosphere
D.
stratosphere
 

 4. 

In the ____, as the elevation increases, the temperature also increases because the atmospheric gases absorb so much of the sun’s ultraviolet light energy as heat.
A.
thermosphere
C.
exosphere
B.
troposphere
D.
stratosphere
 

 5. 

The majority of atmospheric gas is ____ (N2), accounting for about 78 percent of the atmosphere.
A.
oxygen
B.
nitrogen
 

 6. 

____ gas (O2) makes up 21 percent of the atmosphere.
A.
Oxygen
B.
Nitrogen
 

 7. 

____ is used to describe things that result from human activity.
A.
Anthropogenic
B.
Antiplasmatic
 

 8. 

Which of the following is not one of the two reasons to be concerned about nitrogen and oxygen?
A.
can be toxic in high enough concentrations
B.
is thought to contribute to the greenhouse effect in the atmosphere
C.
can combine with other gases to form particulates
 

 9. 

Carbon ____ (CO2) is a colorless, odorless, tasteless, nontoxic, noncombustible, naturally occurring gas that makes up less than 4/100s of 1 percent of the atmosphere.
A.
monoxide
B.
dioxide
 

 10. 

In the atmosphere, the concentration of CO2 gas is measured in parts per ____.
A.
hundred
C.
million
B.
thousand
D.
ten thousand
 

Matching
 
 
Match the question with the correct response
A.
greenhouse effect
F.
particulate matter
B.
anthropogenic emissions
G.
carbon dioxide
C.
lead
H.
ozone depletion
D.
carbon sequestration
I.
ozone holes
E.
sea level
J.
atmosphere
 

 1. 

The blanket of gases that surround Earth
 

 2. 

The mean height of the ocean between high tide and low tide
 

 3. 

Pieces of solid material or liquid suspended in a gas or suspended in the atmosphere
 

 4. 

Gases and particulates that result from human activity
 

 5. 

A by-product of burning carbon-based materials like wood and oil
 

 6. 

The process of anthropogenic ozone loss in the stratosphere
 

 7. 

The seasonal decline in ozone concentrations in the stratosphere above the poles
 

 8. 

The long-term storage of carbon in the biosphere, underground, and in the ocean
 

 9. 

The process by which infrared radiation produces an increase in the observable temperature in a closed system
 

 10. 

Was banned from gasoline
 



 
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