Air Around You & Air Pressure

What are gases in the air called that are found in very small amounts?

• invisible
• trace
• particle
• atmospheric

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

• hydrosphere
• solar system
• atmosphere
• cloud bubble

When gasoline is burned, it releases the gas __________________. 

• carbon dioxide
• oxygen
• nitrogen
• helium

Clouds form when water vapor ________________ out of the air.

• condenses
• evaporates
• precipitates
• percolates

The term used to describe the condition of Earth's atmosphere at a given place or time is ________________.

• climate
• weather
• systems
• status

What do dust, smoke, salt, and chemicals have in common?

• They are gases in the air.
• They make up water vapor in the air.
• They are particles in the air.
• They are only found in pure air.

Which of these does a fire need to burn?

• argon
• carbon dioxide
• nitrogen
• oxygen

Which of these do plants need in order to make food?

• argon
• carbon dioxide
• nitrogen
• oxygen

Which of these makes up about 21 percent of the atmosphere?

• argon
• carbon dioxide
• nitrogen
• oxygen

Air pressure at sea level is _____________ than air pressure at the top of a mountain.

• lower
• higher
• the same