An air mass is warmer at the leading edge and cooler at the trailing edge. An air mass has similar temperature and moisture properties throughout it. An air mass is cooler near the edges and has greater moisture near the center. An air mass has greater moisture near the edges and is cooler near the center.
I gave my students this multiple choice question: Which of the following is true regarding the properties of an air mass?

Only one answer is correct among these 4 choices:
- An air mass is warmer at the leading edge and cooler at the trailing edge.
- An air mass has similar temperature and moisture properties throughout it.
- An air mass is cooler near the edges and has greater moisture near the center.
- An air mass has greater moisture near the edges and is cooler near the center.

Could you tell me which one is correct?

An air mass has similar temperature and moisture properties throughout it.