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The northern lights are caused by solar radiation hitting charged gas molecules in which layer?

• A

• B

• C

• D

Which zone is the exosphere?

• D

• B

• C

• E

According to the figure, which has the highest albedo?

• Fresh snow

• Forest

• Asphalt

• Croplands

Which is the best description of a region's climate?

• The amount of precipitation in a typical year

• The average temperature and precipitation over 5 years

• The average weather that occurs over a long time

• The average high and low temperatures of a region

What level of the atmosphere contains charged gas molecules that contribute to the northern lights, or aurora borealis?

• Troposphere

• Stratosphere

• Mesosphere

• Thermosphere

Which is NOT true about the Sun's energy heating Earth?

• The angle at which the Sun's rays hit Earth depends on the latitude.

• The Sun's rays are concentrated over a smaller surface area at the equator than in higher latitudes.

• The polar regions reflect more sunlight than the tropical regions.

• The Sun's rays are more strongly reflected in the lower latitudes.

Which atmospheric layer contains ozone, a layer that helps protect organisms from the sun's harmful UV radiation?

• Stratosphere

• Thermosphere

• Troposphere

• Mesosphere

What is the importance of the ozone layer?

• It absorbs incoming UV rays.

• It converts UV radiation to IR radiation.

• It contributes to the greenhouse effect.

• It reflects incoming heat back into space.

Which level of the atmosphere contains the ozone layer?

• Stratosphere

• Troposphere

• Thermosphere

• Mesosphere

What best describes the density of the atmosphere?

• It decreases with altitude.

• It increases and then decreases.

• It increases with altitude.

• It remains constant throughout the different layers.