Chapter Six

9. Answer: a. Ice crystals are extremely small and come in several shapes. These are the types of precipitation that cause the phenomenon of ice pillars to be seen.

10. Answer: b. Freezing rain is essentially supercooled rain that reaches Earth, collects on colder areas such as roadways and results in a sheet of ice. This is quite dangerous to travelers.

CHAPTER SIX

1. Answer: c. Each of these are conditions you'll see in a high pressure system, except for windy conditions. In a high pressure system, the air is generally calm with clear skies, dry air, and greater variations in diurnal temperatures.

2. Answer: b. Subpolar low-pressure cells tend to give the cool and rainy weather you often see in the Pacific Northwest. Because this area can extend around the globe, you also see this type of weather in many areas of Europe and near the Antarctic.

3. Answer: a. The summertime months are the ones most conducive to sea breezes. You need a large body of water, warm land air, and high humidity over the ocean to get these as well.

4. Answer: a. Winter and nighttime both involve cooler air over land, which promotes land breezes from the land to the sea.

5. Answer: c. A haboob forms ahead of high winds over a dry and warm desert.

The air in a haboob will be filled with sand and dust particles.

6. Answer: b. The upper level winds over the US involve the Northeast trade winds that send air from the Northeast to the Southwest.

7. Answer: b. In the Northern Hemisphere, all low-pressure systems spin counterclockwise and all high-pressure systems spin clockwise.

8. Answer: c. This line represents a stationary front. It is stalled out to your east so it could mean anything, depending on how this slow-moving front behaves.