Unit 2 7th grade science

When a warm air mass moves in and slides over a cold air mass

• Cold Front

• Low Pressure

• Warm Front

• High Pressure

When a fast-moving cold air mass pushes a warm air mass up, it is called ..........

• a cold front

• a low pressure system

• a warm front

• a high pressure system

A weather front is

• another name for an air mass

• the boundary between two air masses

• a climate region

Weather fronts usually cause clouds and precipitation

• True

• False

Cold air is more dense than warm air and sinks.

• True

• False

What two descriptors describe an air mass?

• moisture content and elevation

• temperature and pressure

• temperature and elevation

• moisture content and temperature

What is a cold front

• when a warm air mass overtakes an existing cold air mass

• when a cold air mass overtakes an existing warm mass

• when a cold air mass and a warm air mass stall out against each other

• when a cold air mass approaches an existing warm front

What is a warm front?

• when a cold air mass overtakes an existing warm air mass

• when a cold air mass approaches an existing warm front

• when a warm air mass overtakes an existing cold air mass

• when a cold and warm air mass meet and neither is able to overtake the other

What happens at a stationary front?

• a cold air mass overtakes an existing warm air mass

• a warm air mass overtakes an existing cold air mass

• a cold and warm air mass meet and neither are able to overtake the other

• a cold air mass approaches an existing warm front

Why does warm air rise?

• because warm air is wet

• because warm air is less dense

• because warm air is denser

• because warm air is dry