Environmental Science
The lag in daily temperature refers to the time lag between the:

Minimum and maximum temperature for a day
Sunrise and sunset
Time of maximum solar radiation and the time of maximum temperature
Time of minimum temperature and the time of maximum solar radiation
Minimum and maximum solar energy received at the surface for a given day

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

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Environmental Science
Although the polar regions radiate away more heat energy than they receive by insolation in the course of a year, they are prevented from becoming progressively colder each year by the:

Circulation of heat by the atmosphere and oceans
Concentration of earth's magnetic field lines at the poles
Conduction of heat through the interior of the earth
The insulating properties of snow
Release of latent heat to the atmosphere when polar ice melts

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