Psychological and physiological dependence on a drug is called tolerance.
a. true
b. false

False.

Explanation:

Tolerance is when, after being exposed to a certain drug for a long period of time, the body can no longer respond to the same dose that used to trigger a biological response, so the dose has to be increased.

As materials are carried away, new surfaces are exposed, which also increases the rate of weathering. Increased temperature increases the rate of chemical reactions, which also increases soil formation. In warmer regions, plants and bacteria grow faster, which helps to weather material and produce soils.