Environmental Science
Frost typically forms on the inside of a windowpane (rather than the outside) because:

The inside of the pane is colder than the outside
There is less water vapor touching the inside of the pane
None of these
There is more water vapor touching the inside of the pane

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Environmental Science
Infrared and visible satellite images might provide:

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

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