A functional region is a. based on other people's views of an area and can overlap with other areas
b. where a service or function is performed
c. based on a node or focal point with a sphere of influence
d. has easy to define borders

What is the thickest layer of earth called?

How does the use of fertilizers impact the environment?

Afarmer who is grown corn for the past five years notices in the sixth year that the his harvest is significantly smaller, despite an increase in labor on the farm. the following year, the harvest continue to decline. which of the following explanations most plausibly accounts for the reduction in corn yield? a) soil degradation b) desalinization c) better irrigationd) terracing