Which of the following describes how the atmospheric greenhouse effect is mainly produced?
A. Gases in the atmosphere absorb and re-emit ultraviolet radiation.
B. Clouds absorb and re-emit visible light.
C. Gases in the atmosphere absorb and re-emit infrared radiation.
D. Gases in the atmosphere absorb and re-emit visible light.
Answer: C
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the freezing point of water is _______ on the Kelvin scale.
a - 0 b - 273 c - 60 d - 32 e - -40
What is an evolutionary trend in hoofed animals in which premolars become more like molars, giving the animals a
continuous series of grinding teeth? a. carnassialization b. herbivorization c. carnivorization d. omnivorization e. molarization
The name given to a portion of Earth's surface is known as
A) location. B) site. C) situation. D) toponym. E) jargon.
A species of bird had an original range covering the entire eastern half of the United States from New England down to Florida, west to the Rocky Mountains
During a period of glaciation, the eastern part of the range was cut off from the western part for 2000 years. Then the glaciers melted and the birds' original range was reestablished. During the separation, the western birds evolved a slightly different song and a darker wing color. Ornithologists are now studying this species to determine whether speciation has taken place. What evidence will they look for in their study?