___________is the result of the weight of a column of air pushing on an area.

• Air pressure

• Density

• Volume

• Mass

In what direction(s) does air exert pressure?

• all directions

• only upwards

• air does not exert pressur

• only downwards

Altitude and elevation have the same meaning. What is it?

• how much something weighs

• the distance above sea level

• how big something is

• how far away something is

As you climb up a mountain what happens to the air pressure?

• the higher you go, the air pressure decreases

• the higher you go the air pressure increases

• no matter how high you go the air pressure stays the same

What happens to the amount of oxygen molecules as altitude increases?

• fewer molecules
• more molecules
• same amount of molecules
• nothing happens to the molecules

What causes winds?

• differences in precipitation

• differences in humidity

• differences in air pressure

• ghosts

78% of earth's atmosphere is composed of ______________.

• carbon dioxide

• oxygen

• water vapor

• nitrogen

Air pressure is greatest when near Earth's surface because?

• The air molecules are far apart.

• The air molecules are packed closer together.

• Air molecules are warmer

• Air molecules are loosely packed but sliding against each other

The atmosphere is a blanket of __________________ that surrounds the Earth.

• gases

• water

• soil

• energy

What are the two most common gases in the atmosphere?

• Nitrogen and oxygen

• Oxygen and carbon dioxide

• Carbon Dioxide and methane

• Nitrogen and carbon dioxide