Composition of the Atmosphere

Front

What is the composition of Earth's atmosphere?

Back

Earth's atmosphere is composed of approximately 78% nitrogen, 21% oxygen, and 1% other gases including argon, carbon dioxide, and trace gases.

Front

Which gas makes up 21% of the atmosphere?

Back

Oxygen.

Front

What gas constitutes the largest percentage of Earth's atmosphere?

Back

Nitrogen, making up about 78%.

Front

What are the two main gases found in the troposphere?

Back

Nitrogen and oxygen.

Front

Where is nitrogen found as an element in the nitrogen cycle?

Back

In the air.

Front

What is the primary gas in the atmosphere of Mars that is also found in Earth's atmosphere?

Back

Nitrogen.

Front

What is the role of oxygen in the atmosphere?

Back

Oxygen is essential for the respiration of most living organisms and is a byproduct of photosynthesis.

Front

What percentage of the atmosphere is made up of argon?

Back

Argon makes up about 0.93% of the Earth's atmosphere.

Front

What is the significance of carbon dioxide in the atmosphere?

Back

Carbon dioxide is a greenhouse gas that helps regulate Earth's temperature and is used by plants during photosynthesis.

Front

What is the function of the ozone layer in the atmosphere?

Back

The ozone layer protects living organisms by absorbing the majority of the sun's harmful ultraviolet radiation.