All the statements below are true. Which one gives the primary reason why the surface of Venus today is some 450C hotter than the surface of Earth?
A) Venus has a much stronger greenhouse effect than Earth.
B) Venus is only about 73 as far from the Sun as Earth.
C) Venus has a much higher reflectivity than Earth.
D) Venus has a higher atmospheric pressure than Earth.
Question 2
Which of the following best describes how the greenhouse effect works?
A) Greenhouse gases absorb X-rays and ultraviolet light from the Sun, and this absorbed radiation then heats the atmosphere and the surface.
B) A planet's surface absorbs visible sunlight and returns this absorbed energy to space as infrared light. Greenhouse gases slow the escape of this infrared radiation, which thereby heats the lower atmosphere.
C) Greenhouse gases absorb infrared light coming from the Sun, and this absorbed sunlight heats the lower atmosphere and the surface.
D) The greenhouse effect is caused primarily by ozone, which absorbs ultraviolet light and thereby makes the atmosphere much hotter than it would be otherwise.
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