The presence of greenhouse gases like carbon dioxide and water vapor in a planet's atmosphere is direct evidence of
A) high surface temperatures as the planet formed.
B) volcanic activity.
C) cometary impacts.
D) the presence of liquid water early in the planet's history.

Question

Quizplus · Accepted Answer

The presence of greenhouse gases like carbon dioxide and water vapor in a planet's atmosphere is direct evidence of volcanic activity. Volcanoes release carbon dioxide and water vapor into the atmosphere, which then trap heat and lead to a warmer planetary surface. This effect is known as the greenhouse effect.

The Presence of Greenhouse Gases Like Carbon Dioxide and Water