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.
Question 2The atmospheric layer in which we live is called the
a. troposphere.
b. stratosphere.
c. thermosphere.
d. ionosphere.
e. exosphere.
Question 3The most abundant gas in the stratosphere is
a. oxygen (O2).
b. nitrogen (N2).
c. carbon dioxide (CO2).
d. ozone (O3).
e. chlorofluorocarbons (CFCs).
Question 4Almost all of Earth's weather occurs in the
a. exosphere.
b. stratosphere.
c. mesosphere.
d. thermosphere.
e. troposphere.
Question 5Earth'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.
Question 6Which weather element ALWAYS decreases as we climb upward in the atmosphere?
a. Wind
b. Temperature
c. Pressure
d. Moisture
e. dew point
Question 7The primary source of oxygen for Earth's atmosphere during the past half billion years or so appears to be
a. volcanic eruptions.
b. photosynthesis.
c. radiant heat.
d. exhalations of animal life.
e. transpiration.
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