Final answer:
The correct statements about Earth's atmosphere are: the most abundant gas is oxygen, carbon dioxide is important for plants, and the troposphere gets colder with increasing height.
Step-by-step explanation:
The correct statements about Earth's atmosphere are:
- The most abundant gas in the atmosphere is oxygen. The atmosphere is composed of roughly 78.1% nitrogen and 21.0% oxygen.
- Carbon dioxide in the atmosphere is important for plants. Plants use carbon dioxide during photosynthesis to produce oxygen and glucose.
- The troposphere gets colder the higher you go. As you go higher in the troposphere, air density and temperature both decrease.
- The stratosphere is located 50 to 80 kilometers from Earth's surface.
- The ozone in the stratosphere protects us from ultraviolet radiation.
- The amount of water vapor in the air is nearly constant.