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6. modify modification modified

a. All air masses are ________________________ slightly by the characteristics of the

regions they pass over

b. Heating at the equator causes a ____________________________in the density of the

air mass.

c. Convection currents can ___________________________the weather in a local area.
d. There haven't been any ________________________________ in the basic mercurial

barometer, but the aneroid barometer has been

____________________________________ . several times to make it more accurate.

e. The ______________________________aneroid barometer doesn't have to be

checked so often.