Air Circulation & Wind

This gas makes up 78% of the atmosphere

• oxygen
• nitrogen
• ozone
• carbon dioxide

High pressure will usually bring what kind of weather?

• Good
• Bad
• Both Good and Bad

What makes up 99% of the atmosphere?

• nitrogen
• oxygen
• carbon dioxide
• nitrogen and oxygen together

Air pressure is

• the weight of all the air above pressing down
• water vapor in the atmosphere
• greenhouse gases
• solar radiation

The layer of gases that surrounds the Earth is known as its

• lithosphere
• hydrosphere
• atmosphere
• biosphere

The _____, or elevation of a mountaintop, is its distance above sea level.

• greenhouse effect
• altitude
• convection
• weather

This gas makes up 21% of the atmosphere

• ozone
• oxygen
• nitrogen
• water vapor

What happens to the density/air pressure of the air as you increase in altitude?

• density increases
• density decreases
• density stays the same
• density disappears

Low pressure will usually bring what kind of weather?

• Sunny
• Calm
• Stormy

Winds are caused by differences in

• precipitation
• humidity
• air pressure
• turbulence