16. What factors explain why the United States' most important trade partner is Canada? a. Culture and lack of resources
b. Climate and physical geography
c. Location and level of development
d. Migration and urbanization

What is the result of the greenhouse effect? a. heat is deflected from the atmosphere. b. heat is released from the atmosphere. c. heat is kept in the atmosphere. d. plants are able to grow in the tropics where the air is the heaviest.

How did the korean war impact the elections of 1952?

What is the famous rainforest in costa rica called?