Composition of the Atmosphere

What is the percentage of oxygen in Earth's atmosphere?

• 1%
• 21%
• 78%
• 90%

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 

The pie chart shows the mixture of gases that compose the atmosphere. Which gas composes 21% of the atmosphere?

• Argon

• Oxygen

• Nitrogen

• Carbon dioxide

Which layer in the atmosphere protects us form harmful UV radiation?

• Ozone
• Troposphere
• Ionosphere
• Exosphere

1.  Why is the Ozone important to life on Earth?

• A.   The Ozone reflects all the Ultra Violet radiation
• A.  The Ozone absorbs all the heat that come up from the Earth.
• The Ozone provides all the oxygen to Earth.
• The Ozone protects the Earth’ s atmosphere and the life on Earth from harmful radiant energy emitted by the sun   

True or False: As you increase in altitude, the temperature of the air decreases because the air molecules become less dense.

• True

• False

Generally, as altitude increases, temperature ___.

• Increases

• Decreases

• Fluctuates

• Stays constant (the same)

Which layer of the atmosphere has the highest density of gas molecules?

• Exosphere

• Mesosphere

• Stratosphere

• Thermosphere

• Troposphere

. Earth is surrounded by an envelope of gases called the _____________.  

• Thermosphere
• Stratosphere
• Troposphere
•  Atmosphere

Tags

NGSS.MS-ESS2-6

Clouds form when water vapor ___________ out of the air.    

•  Evaporates
• Condenses
• Precipates
• Disappears

Tags

NGSS.MS-ESS2-4