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3. Select words from the list below to complete the following sentences. Some of the
words may be used more than once, and you may have to make the word plural or
change the tense. Do not try to write the words in the spaces.

Affect current arctic

Advection equatorial migrate (-ory) (-1on)

air mass jet stream

convection knot

a. The air masses that move southward from the polar region are called
_______________ air masses; they are "cold" highs.

b. Although there is a small difference, a 10- ____________wind moves at about 10
miles an hour.

c. Air masses that have their source at the equator are called ______________

air masses; they are "warm" lows.

d. Polar highs ________ southward; equatorial lows ___________ northward.

e. When he opened the window a _____________ of air blew the papers off the desk.

f. The heating of the ground causes ____________ currents to move upward.

g. Cool air currents, known as ______________ currents, move the ground toward
the local low-pressure area by the convection currents.

h. The main point in understanding weather is to know how heating and cooling
___________ the density of air masses.

i. The _________ that move as part of the general circulation are known as migratory
highs and lows.

j. The upward movement of the air at the equator is an example of ________ currents
caused by heating.

k. The high currents near the tropopause, called _________ , are not considered to be
"air masses.'’

l. A mile is used to measure distance; a ___________ is used to measure speed.

m. Arctic air masses and equatorial air masses are good examples of ______________
air masses..

n. The _________________ of air masses causes the pressure at a station to change.