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Soil dust, salt from ocean waves, forest fire smoke, volcanic ash particles, and pollutants are some of the aerosols found in the atmosphere.

A) True
B) False

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​Which atmospheric layer contains the most mixing and overturning of air?


A) ​stratosphere
B) ​troposphere
C) ​mesosphere
D) ​exosphere
E) ​ionosphere

F) A) and E)
G) C) and D)

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Describe the effect weather can have on human health.

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The following health issues could be of ...

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Fronts are a sharp change in temperature, humidity, and wind direction.

A) True
B) False

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Weather in the middle latitudes tends to move from east to west.​

A) True
B) False

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​A geostationary satellite takes pictures of


A) ​the moon as it is seen from Earth.
B) ​other planets as they are seen from Earth.
C) ​different areas on Earth when it is stationary.
D) ​one area on Earth as it moves at the same rate as Earth's spin.
E) ​any recurring geologic event on Earth.

F) C) and D)
G) B) and C)

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​Which weather element ALWAYS decreases as we climb upward in the atmosphere?


A) ​Wind
B) ​Temperature
C) ​Pressure
D) ​Moisture
E) ​dew point

F) A) and B)
G) B) and D)

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​Falling rain and snow is called


A) ​condensation.
B) ​evaporation.
C) ​sublimation.
D) ​crystallization.
E) ​precipitation.

F) A) and D)
G) C) and D)

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​When applying the scientific method to investigating the atmosphere, scientists study


A) ​the chemistry and physics of water samples.
B) ​the chemistry and physics of air.
C) ​animal behavior in different climates.
D) ​human behavior in different climates.
E) ​the chemical composition of plants occurring in different climates.

F) C) and D)
G) A) and B)

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Briefly explain the production and natural destruction of carbon dioxide near Earth's surface. Give two reasons for the increase of carbon dioxide over the past 100-plus years.

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​Carbon dioxide enters the atmosphere th...

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​The difference in atmospheric density is greatest in the layer bounded by


A) ​1 mb and 10 mb.
B) ​101 mb and 110 mb.
C) ​1001 mb and 1010 mb.
D) ​10001 mb and 10100 mb.
E) ​10101 mb and 11000 mb.

F) A) and C)
G) A) and E)

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​The Sun is surrounded by Earth, and how many other planets?


A) ​five
B) ​ten
C) ​eight
D) ​twelve
E) ​seven

F) B) and C)
G) C) and D)

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​Typically, water vapor occupies about what percentage of the air's volume near Earth's surface?


A) ​about 78 percent
B) ​about 21 percent
C) ​close to 10 percent
D) ​less than 4 percent
E) ​less than 1 percent

F) C) and D)
G) A) and E)

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Describe some of the processes that release and remove carbon dioxide from the atmosphere. Is there any evidence that suggests that these processes are not in balance?

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Carbon dioxide enters the atmosphere mai...

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​Earth's atmosphere is divided into named layers based on the vertical profile of


A) ​air pressure.
B) ​air temperature.
C) ​air density.
D) ​wind speed.
E) ​chemical composition.

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

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​If the air temperature at the surface (0 feet) is 60 °\degree F, what would be the approximate air temperature at an altitude of 10,000 feet, assuming an average atmospheric lapse rate of 3.6 °\degree F per 1000 feet?

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The approximate air temperature would be 24 degrees Fahrenheit.​

​Ozone in the stratosphere


A) ​is a health hazard for people with respiratory illnesses.
B) ​protects life from harmful ultraviolet radiation.
C) ​is one of the main ingredients of photochemical smog.
D) ​provides healthy levels of vitamin D to humans.
E) ​is an aerosol found in the ionosphere.

F) C) and E)
G) D) and E)

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B

​Which statement relates to weather rather than climate?


A) ​The average temperature for the month of January is 28 °\degree F.
B) ​The lowest temperature ever recorded in Frozenlake, Minnesota is -57 °\degree F.
C) ​The foggiest month of the year is December.
D) ​I like the warm, humid summers.
E) ​It is cloudy and snowing outside.

F) None of the above
G) B) and C)

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How has the composition of Earth's atmosphere changed over time? Briefly outline the evolution of Earth's atmosphere.

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​Earth's first atmosphere (some 4.6 billion years ago) was most likely hydrogen and helium-the two most abundant gases found in the universe-as well as hydrogen compounds such as methane and ammonia. A second, more dense atmosphere gradually enveloped the Earth as gases from molten rock within its hot interior escaped through volcanoes and steam vents. We assume that volcanoes spewed out the same gases then as they do today: mostly water vapor (about 80 percent), carbon dioxide (about 10 percent), and up to a few percent nitrogen. As millions of years passed, the constant outpouring of gases from the hot interior (outgassing) provided a rich supply of water vapor, which formed clouds. Rain fell upon the earth for many thousands of years. Large amounts of CO2 were dissolved in the oceans. The atmosphere gradually became rich in nitrogen (N2). Oxygen (O2), the second most abundant gas in today's atmosphere, probably began an extremely slow increase in concentration as energetic rays from the sun split water vapor (H2O) into hydrogen and oxygen during a process called photodissociation. Hydrogen, being lighter, likely rose and escaped into space while the oxygen remained in the atmosphere. After plants evolved, the atmospheric oxygen content increased more rapidly, likely reaching its present concentration several hundred million years ago.

​The temperature of the tropopause


A) ​is close to the temperature at Earth's surface.
B) ​is much colder than the temperature at Earth's surface.
C) ​has never been measured.
D) ​is much warmer than the temperature at Earth's surface.
E) ​is nearly the same as the sun's temperature.

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

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