"Studying populations and Water Pollution": HTML5 Crossword

Across

1. What is the study of populations called. (10)
3. Water that contains waste from homes or industry. (10)
8. ____account for only about 5 percent of oil pollution in the oceans. (3,6)
12. Pollution discharged from a single source. (5,6,9)
14. Movement into an area is. (11)
15. Demographers can make many predictions based on ____ which is the distribution of ages in a specific population at a certain time. (3,9)
17. The average number of children a woman gives birth to in her lifetime is called the. (9,4)

Down

1. incomes, simple and agriculture-based economies, and rapid population growth. (10,9)
2. The movement of individuals between areas is called. (9)
4. The average number of children each parent must have in order to “replace” themselves in the population is the. (11,5)
5. Movement out of an area is. (10)
6. Pollution which comes from many different sources that are often difficult to identify. 96% of the polluted waters in the U.S. are from this source. (8,6,9)
7. The introduction of chemical, physical, or biological agents into water that degrade water quality and adversely affect the organisms that depend on the water. (5,9)
9. The buildup of pollutants at higher levels of the food chain is called. (16)
10. Another way to predict population trends is to study_____, which is the percentage of members of a group that are likely to survive to any given age. (12)
11. This category of countries have higher average incomes, slower population growth, and diverse industrial economies. (9,9)
13. Animal and plant matter remains, feces, food waste, and debris from food-processing plants. (7,6)
16. When lakes and slow-moving streams contain an abundance of nutrients, they are (9)