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

A parallel of latitude
A tornado
A cold front
A warm front

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Environmental Science
Infrared and visible satellite images might provide:

A way of distinguishing between wet and dry clouds.
A way of identifying clouds suitable for cloud seeding.
A way of determining cloud thickness and altitude.
A way of distinguishing between "new" and "old" clouds.

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