In-lecture quiz #1

1. The shallow nature of Earth’s atmosphere is due to gravity pulling the gas molecules toward the Earth’s surface.
   
   
2. Water vapor and carbon dioxide are the two most abundant variable gases, on average.
   
   
3. The concentration of water vapor in Earth’s atmosphere tends to go up when the temperature goes up.
   
   
4. Ultraviolet radiation in sunlight is absorbed by ozone in the stratosphere.
   
   
5. Greenhouse gases, such as water vapor, carbon dioxide, and methane, absorb infrared radiation.