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Exam 5: Condensation - Dew - Fog - and Clouds

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Question 41

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​Water vapor cannot condense onto hygroscopic nuclei particles at relative humidities less than 100 percent.

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Question 42

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​Cirrus clouds are composed primarily of

A) ​water droplets.
B) ​water vapor.
C) ​ice particles.
D) ​salt aerosols.
E) ​dust particles.

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Question 43

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​High cirriform clouds are composed almost entirely of ice crystals. In tropical regions, air temperatures low enough to freeze all liquid water usually occur only above 6000 m (about 20,000 ft). In polar regions, however, these same temperatures may be found at altitudes as low as 3000 m (about 10,000 ft). Hence, while you may observe cirrus clouds at 3600 m (about 12,000 ft) over northern Alaska, you will not see them at that elevation above southern Florida.

Even at high elevations where cirrus clouds are found, liquid water still exists in the clouds.

​Hail is usually associated with ____ clouds.

​Radiation fog typically forms on

​Nuclei with a radius of less than 0.1 µm are referred to as ____ nuclei.

​Explain how dew, frozen dew, and visible frost form.

​Because fog causes a lot of problems, such as accidents, scientists are seeking ways to disperse, or at least "thin" fog.

​Condensation nuclei may be made up of salt from the ocean.

​When a cloud forms over and extends downwind of an isolated mountain peak, it is called a ____ cloud.

​The cooling of the ground to produce dew is mainly the result of

​Satellite images provide detailed information on cloud ____________________ and ____________________.

​Which cloud type is composed of ice crystals and can cause a halo to form around the Sun or Moon?

​In 1887, Ralph Abercromby and Hugo Hildebrandsson expanded Howard's original cloud classification system and published a classification system that, with only slight modification, is still in use today. In their system, ____ principal cloud forms are divided into ____ primary cloud groups.

​When temperatures are below freezing, the temperature to which air must be cooled in order for a phase change (from liquid to ice) to occur is called the

​Fog is often described as a cloud that forms at ground level. In what ways are the formation of fog and clouds similar and different?

​Suppose two ocean currents with different temperatures are flowing next to one another. If the wind blows perpendicular to the currents, we would expect to find

​These types of clouds make the Sun appear as a dimly visible round disk.

​A layer of dust or salt particles suspended above a region is called ____________________.