Which gas makes up the largest component of Earth's atmosphere?

• oxygen
• nitrogen
• argon
• carbon dioxide

Which statement describes the general movement of air masses? 

• they move from high pressure to low pressure
• they move from low pressure to high pressure
• they move from high temperature to low temperature
• they move from low temperature to high temperature

low pressure systems are characterized by all of the following EXCEPT

• counterclockwise movement
• rising air
• warm, moist air and precipitation
• cool, dry air and sunny days

High pressure systems are characterized by all of the following except

• sinking dense air
• cool, dry, sunny weather
• clockwise movement
• warm, wet weather

The layer of the atmosphere that contains most of the water vapor and weather is the

• troposphere
• thermosphere
• mesosphere
• stratosphere

The _____ protects us from the harmful UV rays of the sun.

• Troposphere
• Ozone Layer
• Exosphere
• Stratosphere

The force of a column of air pressing down is called what?

• Air Mass
• Air Pressure
• Air
• Heavy

A measure of the amount of water vapor in the air is called what?

• Rigidity
• Moisture
• Humidity
• Fog

These type of clouds are found highest in the atmosphere and contain ice crystals.

• cumulus
• cirro
• alto
• nimbus

This type of cloud is associated with violent thunderstorms and is the largest type of cloud.

• cirrus
• cumulus
• nimbostratus
• cumulonimbus