When gasoline or other fuels are burned ______________ gas is released.

Water falling form the clouds in the form of rain, sleet, or snow is called:

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

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

Which of these does a fire need to burn?

Which of these do plants need to make food using photosynthesis?

which gas makes up about 21 percent of dry air in the atmosphere?

True or False: Oxygen is the most abundant gas in the atmosphere.

Carbon dioxide makes up much less than 1% of Earth's atmosphere.

Water exists as both a liquid and a gas in our atmosphere.

There is more water vapor in the ​ (a)   than in the ​ (b)   .

True or False: Pure air contains only gases.