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III. VOCABULARY EXPANSION: Oral Exercises

Read the sentence given, say the verb form of the underlined noun, and make a
sentence using the verb form. Your sentences should say something about weather.
a. When the flow of air meets an obstruction it must either go over
it or around it.

b. There is a standard classification for the intensity of turbulence.
c. The table gives a description of the effects of the different intensities

of turbulence.

d. The variation in turbulence is very large, from small bumps to severe jolts.

e. The division of turbulence into four types is based on the causes of

the turbulence.

f. Uneven heating of the earth near an airport may produce currents that

affect an aircraft's descent.

g. Long lines of mountains can produce severe disturbances in the airflow.

h. Rotor and lenticular clouds indicate the existence of severe turbulence.

i. At night the radiation of heat from the ground may cause an inversion layer

to form.

j. The determination of the location of CAT is largely dependent on pilots'

reports.

k. The expansion caused by warming lowers the density of the air.

l. The northward movement of the air produces an accumulation

of air in the northern part of the hemisphere.

m. There is a general circulation of the air from the equator to the poles and

back again.

n. Weathermen spend many hours practicing the identification of different
cloud types.

o. Towering cumulus clouds are definite indications of unstable air.

p. Any reduction of temperature in saturated cold air may produce fog.