Geographers often seek to categorize places using a scale of development, frequently dividing nations into the "developed" and "developing," "first world" and "third world," or "core" and "periphery." All of these labels are based on judging a country's development, but this raises the question: what exactly does it mean to be "developed," and why have some countries developed while others have not? Since the beginning of the twentieth century, geographers and those involved with the vast field of Development Studies have sought to answer this question, and in the process, have come up with many different models to explain this phenomenon.

Match your vocabulary word to its definition. 1. emigration 2. immigration 3. migration 4. overpopulation 5. sustainable development 6. under population 7. unsustainable development 8. urbanization the movement from one place to another the number of people exceeds the available natural resources in an area leaving one's homeland to settle in a new place the increase in the population of a city the movement of people to a new country the ability to meet current needs without reducing the ability to meet future needs resources being used up at a faster rate than they can be replenished birth rate insufficient to replace the existing population

Hurricanes a. usually form over land b. usually intensify over land c. gain strength from ocean heat d. usually form over the poles

Which of these is the sound of fish slapping against human flesh?