Properties of the Atmosphere

The 78% of the normal composition of air is...?

• Oxygen 
• Nitrogen
• Carbon dioxide
• Argon

What is the major cause for air pollution? 

• factories and cars
• cigarretes 
• deforestation
• oil spills

What is NOT a property of air

• It is invisible  
• It has mass
• It takes up space
• It moves from low to high pressure

21% of the air around us is composed (made up of) what type of molecule?

• H20
• Argon
• Oxygen
• Helium 

As you increase in altitude, the number of molecules will ___________

• Decrease 
• Increase
• Stay the same

As elevation increases, air pressure ...

• increases

• decreases

• stays the same

What percent of our air is oxygen?

• 78%

• 1%

• 12%

• 21%

What is the formula for calculating density?

• Mass ∗ Volume
• Volume ∗ Mass
• Mass ÷ Volume
• Volume ÷ Mass

78% of the air around us is composed (made up of) what type of molecule?

• Nitrogen
• Oxygen
• Carbon Dioxide
• Hydrogen

Hot air ___________ and cold air __________

• Sinks, Rises
• Rises, Sink
• is fun, is lazy