1. Which two processes lead to cloud formation in rising air?
(1) compressing and cooling
(2) compressing and warming
(4) expanding and warming
(3) expanding and cooling

2. Air rises, expands, cools, reaches the dewpoint, and forms clouds for three reasons…

3. three reasons…
It is “naturally” less dense (hot, wet).

4. Warm, moist, low pressure, and low density.

5. This can lead to afternoon thunderstorms.

6. Which sequence of events affecting moist air within Earth’s atmosphere causes cloud formation?
(1) rising → expanding → cooling → condensation
(2) rising → contracting → warming → evaporation
(3) sinking → expanding → warming
→ condensation
(4) sinking → contracting → cooling → evaporation

7. three reasons… It is “naturally” less dense (hot, wet).
It is forced up by an obstacle.

8. Air is often forced up mountains.

9. World’s tallest building
This can even happen at tall buildings!
Burj Tower, Dubai, UAE
World’s tallest building

11. The other side (LEEWARD) has sinking, compressing, warming air.
The side facing the wind (WINDWARD) has rising, expanding, and cooling air.
Cool & Wet
Warm &
Dry
The other side (LEEWARD) has sinking, compressing, warming air.

12. Deserts can be caused by mountain range “rain shadow”.

13. Deserts can be caused by mountain range “rain shadow”.

14. (1) cooler and drier (3) warmer and drier
The cross section below shows the direction of air flowing over a mountain. Points A and B are at the same elevation on opposite sides of the mountain.
Compared to the air
temperature and humidity
at point A, the air temperature
and humidity at point B are usually
(1) cooler and drier (3) warmer and drier
(2) cooler and wetter (4) warmer and wetter

15. three reasons… It is “naturally” less dense (hot, wet).
It is forced up by an obstacle.
It is forced up by more dense air.

16. Cold, dry, more dense air often “bumps into” warmer, wetter less dense air at a weather front.

17. Cold, dry, more dense air often “bumps into” warmer, wetter less dense air at a weather front.