Select from the following.
(I) salinity.
(II) variable.
(III) heat energy.
(IV) reduce.
(V) streams..
(VI) streams.
(VII) down.
(VIII) evaporation.

Fact 1: If soil is permeable then water easily flows through that soil. Fact 2: Permeability is affected by many soil characteristics. Given the two facts above, what is the rate of water flow of soil?
Answer:
(II)