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2. 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.
occupants draft upwind

shear level chop
thermal downwind

a. Since convection currents are caused by heating, they are also called _________
currents.

b. Mechanical turbulence can be expected in the __________ area from an obstacle.
c. If a car has a driver and three other people in it, it has four ______________ .
d. The towers of cumulus clouds are formed by up _________________________.
e. CAT is a special form of high ______________ turbulence.
f. Since the bumping caused by the turbulence was continuous, the pilot reported

it as ________________.
g. If the wind is blowing from your position toward an obstacle, you are ___________

_______from the obstacle.
h. If the air is still near the ground and moving at a higher altitude, there is wind
_______________ near the border of the two layers.

i. Mechanical turbulence is classified into two general types, high _____________

mechanical turbulence and low ____________mechanical turbulence, according
to the altitude it occurs at.

j. When there is a local convection circulation, the hot air rises as up _____________
and the cool air descends as down _____________ .

k. Since upward and downward currents move at different speeds than the air
around them, wind ____________ occurs along the edges of the currents.

l. When an aircraft is flying through turbulence, the ____________ of the aircraft
should keep on their seatbelts.
m. A sunny day is more likely to produce. _________currents than a cool cloudy day.
n. If the wind is blowing from the east, the eastward side of an obstacle is the
___________side, the westward side is the side.