Answer
1. When air masses meet, it is called a front.
2. A front is a boundary between two air masses with different temperatures, humidity levels, and air pressures. You can remember it as the "front line" of a battle between two air masses.
3. The letter "C" in the word "COLD" reminds you that cold air sinks down.
4. A cold front's signature wrestling move is a "takedown" of warm air, causing it to rise rapidly and form thunderstorms.
5. The letter "R" in the word "WARM" reminds you that warm air rises up.
6. A warm front's signature wrestling move is a "pinning" of cold air, causing it to slowly retreat and be replaced by warm air.