Air that rises always:
A)contracts and warms.
B)contracts and cools.
C)expands and cools.
D)expands and warms.
The sun emits its greatest intensity of radiation in:
A)the visible portion of the spectrum.
B)the infrared portion of the spectrum.
C)the ultraviolet portion of the spectrum.
D)the x-ray portion of the spectrum.
If the earth's average surface temperature were to increase,the amount of radiation emitted from the earth's surface would __________ and the wavelength of peak emission would shift toward __________ wavelengths.
Without the atmospheric greenhouse effect,the average surface temperature would be:
A)higher than at present.
B)lower than at present.
C)the same as it is now.
D)much more variable than it is now.