WONDER #799: What Is a Cold Front?

Question 1 of 3

The boundary between air masses of different temperatures is known as a what?

1. airline
2. front
3. airlock
4. cloudline

Question 2 of 3

Colder air is more what compared to warm air?

1. dense
2. polluted
3. pure
4. oxygenated

Question 3 of 3

Cold fronts usually move from northwest to which direction?

1. northwest
2. northeast
3. southwest
4. southeast

Check your answers online at https://wonderopolis.org/index.php/wonder/what-is-a-cold-front.