Environmental Science
Often before sunrise on a clear, calm, cold morning, ice (frost) can be seen on the tops of parked cars, even when the air temperature is above freezing. This condition happens because the tops of the cars are cooling by:

Convection
Latent heat
Radiation
Conduction

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Environmental Science
An important reason for the large daily temperature range over deserts is:

Free convection cells are unable to form above the hot desert ground
There is little water vapor in the air to absorb and re-radiate infrared radiation
The ozone content of desert air is very low
The light-colored sand radiates heat very rapidly at night
Dry air is a very poor heat conductor

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Environmental Science
Which of the following helps to explain why even though northern latitudes experience 24 hours of sunlight on June 22, they are not warmer than latitudes further south?

Increased cloud cover reflects solar energy in the northern latitudes
Some of the sun's energy is reflected by snow and ice in the northern latitudes
All of these
Solar energy is spread over a larger area in northern latitudes
Solar energy is used to melt frozen soil in the northern latitudes

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