Answer: B. After absorbing solar energy, Earth's surface emits long-wave radiation, which is absorbed by water vapor, carbon dioxide, and other trace gases in the atmosphere. These gases, in turn, emit some of the energy back down to Earth.
Explanation: The greenhouse effect is defined as when the Earth's atmosphere becomes thick with gases and substances which trap the sun's radiation, making the Earth warmer. An example of the greenhouse effect is global warming. It is a process by which plants are able to grow well in a warm, enclosed structure. It is a process by which greenhouse gases block the sun's light to penetrate the atmosphere.