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f. (1) Air begins to flow from areas of higher pressure to areas of lower pressure.

(2) The equilibrium of atmospheric pressure is disturbed.

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g. (1) The air at the equator expands and rises.

(2) The earth receives more heat, at the equator and transfers it to the air.
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h. (1) The air in the northern hemisphere is deflected toward the earth.

(2) The air rise's and moves northward from the equator.

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i. (1) Air masses move away from their source regions.

(2) Air masses are constantly modified by the areas they pass over.
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k. (1) Two air masses that meet normally do not mix.

(2) Two air masses have similar temperatures, pressures, and relative humidity.

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l. (1) The warm air mass is replaced by a colder air mass.

(2) The warm air mass moves back from a given area.
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