The idea that regions are fluid means that
a.
earth’s surface is floating on a hot magma layer
b.
a region cannot support life without a source of freshwater
c.
a region is difficult to define because it is influenced by people's perceptions and perspectives
d.
formal geographic and political boundaries define a region

In the construction of new housing development, which factor of production can be categorized as land?

What is most likely the effect of unrestricted hunting of gray wolves on the food web of the region

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