Environmental Science
The ratio of the mass of water vapour in a given volume (parcel) of air to the mass of the remaining dry air describes the:

Dew point
Absolute humidity
Mixing ratio
Relative humidity

ANSWER DOWNLOAD EXAMIANS APP

Environmental Science
Infrared and visible satellite images might provide:

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

ANSWER DOWNLOAD EXAMIANS APP