Most of the agricultural productivity of the United States and Canada is concentrated in which two physiographic regions?
A) Coastal Ranges and Intermontane Basin and Plateau
B) Coastal Ranges and Great Plains
C) Gulf-Atlantic Coastal Plain and Great Plains
D) Interior Highlands and Interior Lowlands
E) Interior Lowlands and Great Plains
Question 2
All of the following is true about Canadian oil reserves, except:
A) second only to Saudi Arabia
B) extracted from tar sands
C) located in Alberta
D) degraded 1 million acres of forest
E) bitumen extraction is toxic
Risks of infectious disease increase in (a) high-density agricultural populations compared to (b) lo
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