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Where cold surface air replaces warm air, the boundary separating the different bodies of air is:

Where cold surface air replaces warm air, the boundary separating the different bodies of air is: Correct Answer A cold front

An air mass is a large body of air that has similar moisture (density) and temperature characteristics. A front is a transition zone between two air masses. A cold front is a warm-cold air boundary with the colder air replacing the warmer.

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I. Warm currents are rich in phosphates and nitrates
II. Plankton - the chief fish feed - thrives in these regions
III. The meeting of cold and warm currents allows the water to be well aerated
IV. The epicontinental seas allow sunlight to reach almost to the bottom
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