1. Which of the following best describes the melting process?

A. a solid changing into a liquid

B. a liquid changing into a solid

C. a solid changing into a gas

D. a gas changing into a solid

2. How are the air temperature and the melting of snow related?

A. directly

B. inversely

C. no relationship

3. How are altitude and the melting of snow related?

A. directly

B. inversely

C. no relationship

4. Particles in the solid phase can:

A. vibrate only.

B. change positions only.

C. both vibrate and change positions.

D. neither vibrate nor change positions.

5. Particles in the liquid phase can:

A. vibrate only.

B. change positions only.

C. both vibrate and change positions.

D. neither vibrate nor change positions.

6. Which particles have the greatest amount of kinetic energy?

A. snow at -4 °C

B. snow at 0 °C

C. liquid water at 0 °C

D. liquid water at 4 °C

7. How are relative humidity and the melting of snow related?

A. directly

B. inversely

C. no relationship

8. For snow to melt, heat energy must be added to the snow.

A. true

B. false

9. Snowflakes are melting as they fall through the air. This melting occurs because the snowflakes:

A. lose heat and the surrounding air loses heat.

B. lose heat and ht surrounding air gains heat.

C. gain heat and the surrounding air gains heat.

D. gain heat and the surrounding air loses heat.