Question

which statements about earths atmosphere are correct? check all that apply.
the most abundant gas in the atmosphere is oxygen.
carbon dioxide in the atmosphere is important for plants.
the troposphere shields earth from chunks of rock from space.
the stratosphere is located 50 to 80 kilometers from earths surface.
the troposphere gets colder the higher you go.
the ozone in the stratosphere protects us from ultraviolet radiation.
the amount of water vapor in the air is nearly constant.

Explanation:

• The most abundant gas in the atmosphere is nitrogen (about 78%), not oxygen (about 21%), so the first statement is wrong.
• Plants use carbon dioxide in photosynthesis, so carbon dioxide in the atmosphere is important for plants.
• The mesosphere (not the troposphere) shields Earth from chunks of rock (meteoroids) from space.
• The stratosphere is located from about 10 - 50 kilometers from Earth's surface.
• In the troposphere, temperature generally decreases with altitude (gets colder the higher you go).
• Ozone in the stratosphere absorbs ultraviolet radiation, protecting us.
• The amount of water vapor in the air varies greatly depending on location and weather conditions.

Answer:

• Carbon dioxide in the atmosphere is important for plants.
• The troposphere gets colder the higher you go.
• The ozone in the stratosphere protects us from ultraviolet radiation.