World Population

4. resources cannot be replaced.Examples are fossil fuels and minerals
5. _____ layer. This is a layer of O3 (triatomic oxygen) in the air that prevents harmful radiation from reaching the earth. This layer is developing holes. The damage is attributed to CFC’s that are used in aerosols and air conditioners.
8. The number of given species in a specific area at a particular point in time
9. waste is waste originating from the home.
12. World population has greatly ________
14. is a lack of the proper nutrients.
15. Natural resource preservation is the nonuse of a natural resource.
17. _____ Zero population growth is the result of the birth rate being equal to the death rate
18. unused materials or discarded particles.
19. Natural resource conservation is the wise use of a natural resource, preventing unnecessary damage or loss.
20. is liquid waste containing water with solid materials.
21. is the act of using resources faster than they can be restored or preserved.

1. is when once productive land forms into desert. This happens to about 15 million acres per year worldwide.
2. leads to depletion of resources, hunger, and conflict.
3. is the lack of calories for energy.
6. is any activity that threatens a species with extinction.
7. Improperly disposed waste causes problems, such as_________
10. Plants and animals used as sources of food, clothing and shelter require these resources.Water, soil, air, wildlife and forests
11. increased birth rate and lower mortality rate as people are living longer through better ______
13. which is the warming of the earth’s surface. This is caused by the CO2 in the air from burning fossil fuels trapping radiation near the earth.
16. is an acute shortage of food.