Define each term. Two (2) points each.

1. activity space -

2. time distance -

3. hydroelectricity -

4. maximum sustainable yield -

5. state farm -

6. collective farm -

7. double cropping -

8. biomass -

9. light industry -

10. command economy -

Completely answer each question. Five (5) points each.

11. List and define five (5) barriers to migration.

12. Explain the difference between the command and demand economies.

13. Explain the difference between renewable and nonrenewable resources. Give examples.

14. Define push and pull factors. List three (3) examples of each.

15. Analyze Weber's "least cost theory."

16. Differentiate between heavy and light industry.

17. List and define the four (4) sectors of the economy. Give an example of an occupation in each sector.

Completely answer the following essay questions. Use complete sentences. Ten (10) points each.

18. More than one half of the world's workers make their living in agriculture. Explain in detail the differences between subsistence, commercial, intensive, and extensive agriculture.

19. List the five (5) reasons listed explaining why Americans migrate. Define each reason and give several examples for each.