🔍 Key Concepts

• Air mass definition in basic meteorology • How air picks up new temperature and moisture characteristics as it moves • The specific meteorological term for changing an air mass’s properties over time

💭 Think About

• Ask yourself: when an air mass travels over a warmer ocean or a colder land surface, what is the NAME of the process that changes its properties? • Which of these choices are basic phase changes of water, and which sound more like a large‑scale weather/air mass process? • Think about standard weather textbook terminology: what do we call it when an air mass is altered by the surface it passes over?

✅ Before You Answer

• Identify which options describe phase changes of water (solid ⇄ gas ⇄ liquid) rather than air mass properties. • Eliminate any terms that are NOT common in meteorology to describe changing an air mass. • Choose the term that specifically refers to altering an existing air mass’s temperature and humidity as it moves.