3. Huge bodies of air that forms over water or land in tropical or polar regions.

4. The place where two air masses meet.

5. Warm air mass collides and rides over a cold air mass. Might produce long periods of precipitation and warmer temperatures.

6. A cold air mass collides and slides under a warm air mass. May produce thunderstorms, tornados and cooler temperatures.

7. Neither a cold air mass nor a warm air mass moves at frontal boundary. May produce long periods of precipitation.

9. A cold air mass pushes into a warm air mass that is behind a cool air mass. The warm air mass is pushed up above the cooler air masses May produce long periods of precipitation.

10. Symbols for types of fronts