All of the following are problems associated with Columbia's dependence
on a single cash crop
Except

The primary agent of contact metamorphism is

One of the main reasons societies settled along rivers in the neolithic era was because a) the village elders demanded it. b) the land there was more valuable. c) it was more safe and secure there. d) it provided irrigation for farming.

Suppose you had to resolve the problems believed to be caused by distance decay in russia. what would you suggest?