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Which of the following is true of UV exposure?


A) UVA radiation is not filtered by the ozone layer and amounts for about 25% of all UV radiation reaching the surface of Earth.
B) Only exposure to UVA is a concern,not exposure to UVB and UVC.
C) UV radiation is potentially harmful and individuals should take appropriate precautions depending on the UV index.
D) UV radiation varies temporally according to the season,local weather conditions,and overhead ozone depletion.

E) A) and D)
F) None of the above

Correct Answer

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Peroxyacetyl nitrates (PAN)are damaging to plants,but not to humans.

A) True
B) False

Correct Answer

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By volume,nitrogen is the most abundant gas in the modern homosphere.

A) True
B) False

Correct Answer

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Where is the thermopause located?


A) It lies between the mesosphere and the thermosphere.
B) It exists wherever -90Ā°C is recorded.
C) It is located approximately 480 km above the surface of Earth.
D) It is positioned at the bottom of the homosphere.

E) A) and B)
F) All of the above

Correct Answer

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How do temperatures change within the stratosphere?


A) They decrease with altitude according to the normal lapse rate.
B) They remain about the same from the tropopause to the stratopause.
C) They increase with altitude because of the absorption of ultraviolet radiation.
D) They decrease with altitude due to radiation losses.

E) A) and C)
F) B) and C)

Correct Answer

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Which of the following is true regarding air pollution?


A) Natural sources of air pollution are not a concern in terms of human health.
B) Natural sources of air pollution are a relatively new occurrence.
C) Though infrequent,natural events that produce air pollution may cover large areas.
D) There is no reason to be concerned about natural sources of air pollution.

E) B) and C)
F) All of the above

Correct Answer

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Which of the following is a by-product of photosynthesis?


A) Nitrogen.
B) Argon.
C) Oxygen.
D) Xenon.

E) A) and B)
F) B) and C)

Correct Answer

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So far,the Arctic region has been free of air pollution.

A) True
B) False

Correct Answer

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Air pollution can easily cross national boundaries.

A) True
B) False

Correct Answer

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Atmospheric circulation ultimately connects all places on Earth to one another.

A) True
B) False

Correct Answer

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Despite its high temperatures,why would the thermosphere feel cold to humans?


A) The number of molecules is not high enough to transfer heat to human skin.
B) Humans would die due to pressure changes before they could experience the intense heat.
C) The atmosphere is denser in the thermosphere and this pressure reduces heat transfer.
D) The average kinetic energy is actually less in the thermosphere than the troposphere.

E) A) and D)
F) None of the above

Correct Answer

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The Clean Air Act has not been cost effective.

A) True
B) False

Correct Answer

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A decline in sulfur dioxide has led to a lower pH in precipitation in the US Mid-Atlantic states.

A) True
B) False

Correct Answer

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Based on the criteria of composition,the atmosphere is divided into two broad regions: the ionosphere and the ozonosphere.

A) True
B) False

Correct Answer

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Which of the following is true regarding the depletion of ozone in the ozonosphere?


A) The depletion is restricted to the arctic and antarctic regions.
B) It results from chemical reactions with chlorine derived from CFCs.
C) It results from the burning of fossil fuels.
D) The notion that ozone is being depleted as a result of human activity has little scientific evidence to support it.

E) C) and D)
F) B) and D)

Correct Answer

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The normal lapse rate for temperature decreases is an average of 3CĀ° per 1000 m.

A) True
B) False

Correct Answer

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Approximately fifty percent of the atmosphere is compressed by gravity below an elevation of 5500 m.

A) True
B) False

Correct Answer

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Which of the following is a major source for photochemical reactants in North America?


A) Steel mills and the agricultural industry.
B) Electrical generation stations.
C) Automobiles.
D) Rapid transit,buses,and excessive use of light rail systems.

E) A) and D)
F) None of the above

Correct Answer

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Rainfall is naturally acidic due to the presence of carbonic acids.

A) True
B) False

Correct Answer

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Ozone is found in both the ozonosphere and as a component of smog.Discuss its properties and function in the ozonosphere,and also its destruction by anthropogenic chemicals and the international efforts undertaken to ameliorate the destruction.Also examine ozone's production and effects at ground level.

Correct Answer

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Briefly,stratospheric ozone protects Ear...

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