Which of the following gases has the highest atmospheric composition within the Earth's Atmosphere?

• Oxygen at 78%
• Nitrogen at 78%
• Carbon Dioxide 78%
• Methane 78%

During the "Composition of the Atmosphere" Lab Activity, 21 out of the 100 beads were oxygen. Using this correlation with the Earth's atmosphere, what is the percentage of oxygen in the air?

• 2.1% of gaseous Oxygen can be found within air.
• 21% of gaseous Oxygen can be found within air.
• 0.21% of gaseous Oxygen can be found within air.
• 78% of gaseous Oxygen can be found within air.

The composition of the air can consist of a mixture of gases and particulate matter. What are some examples of particulate matter found within the atmosphere?

• Dust
• Pollen
• Both dust and pollen

Which of the following gases is not part of the earth's atmosphere?

• Nitrogen
• Oxygen
• Argon
• Copper Sulfate

Which of the following gases is not a trace gas?

• Nitrogen
• Carbon Dioxide
• Methane
• Water Vapor

Why is more atmospheric pressure at lower altitudes than at higher altitudes? remember, use the website link to try and answer the question...

What are the three main components to the atmosphere along with their percent concentration?

Why do living things need oxygen, nitrogen, and carbon dioxide?

What is "particulate matter", and give several examples of particulate matter in the air we breathe?

If living organisms use oxygen and nitrogen, how is it possible that the concentration of each of these gases is maintained at a constant level?