What causes the greenhouse effect?
A. Ozone absorbs solar ultraviolet radiation and warms the atmosphere.
B. Water vapor and carbon dioxide absorb infrared radiation from the ground and reradiate the heat toward the surface.
C. Oxygen and nitrogen scatter sunlight which heats the atmosphere by its frictional passage.
D. Water vapor and carbon dioxide absorb visible sunlight and warms the atmosphere.
E. Fluorocarbons absorb infrared radiation from the Sun and heat the surface.
Answer: B
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