Atmospheric Gases

Which element makes up the LEAST amount of the air breathe?

• Carbon

• Nitrogen

• Oxygen

• Argon

A certain element makes up 78 percent of Earth's atmosphere. It interacts with other elements to provide many of the nutrients needed in an ecosystem. What is the name of this element?

• Nitrogen

• Oxygen

• Carbon

• Chlorine

In the nitrogen cycle, where is nitrogen found as an element?

• in plants

• in rocks

• in the air

• in animals

The table indicates the percentage of some gases in the atmosphere of Mars. Which gas present in the atmosphere of Mars is the primary gas found in the atmosphere of Earth?

• Carbon dioxide

• Nitrogen

• Argon

• Methane

____________ makes up 78% of the Earth's atmosphere.

___________ makes up 21% of the Earth's atmosphere.

True or False: Oxygen makes up the largest amount of the Earth's atmosphere.

• True

• False

True or False: Nitrogen makes up the least amount of the Earth's atmosphere.

• True

• False

What are the 2 most abundant gases in Earth's atmosphere?

• carbon dioxide and oxygen

• carbon dioxide and nitrogen

• nitrogen and oxygen

• nitrogen and hydrogen 

This gas retains heat from the sun that would otherwise escape from Earth's atmosphere.

• carbon dioxide

• ozone

• oxygen