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b. (1) The height of the column of mercury varies.

(2) The height of the column of mercury indicates changes in atmospheric pressure.
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c. (1) The hollow container expands and contracts.
(2) The hollow container moves an indicator arm up and down a scale to show
pressure changes.
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d.

(1) The air at the equator expands.
(2) The air' at the equator rises and moves toward the poles.

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e. (1) The air circulates.

(2) The air follows a regular path from the equator to the poles and back.
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f. (1) The cold air contracts.

(2) The cold air descends to the surface near the poles.
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g. (1) The large high- and low-pressure systems migrate.
(2) The large high- and low-pressure systems have the temperature and humidity
characteristics of their source regions.
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