(25)Unit 8 Vocab Words London Mitchell

4. a pattern of urban development characterized by low-density, decentralized growth.
7. a row of trees or shrubs planted to protect crops, livestock, and buildings.
8. when livestock consume vegetation at a rate faster then it can grow.
9. The process of population growth and exparision or urban areas.
13. The release of pollutants or substances into the environment.
14. the decline in the quality and health of soil due to various factors.
15. a naturally occurring radioactive gas that can seep into buildings from the ground.
18. where temperatures are significantly higher than in surrounding rural areas due to human activities.
19. Natural fuels formed from the remains of living organisms.
20. a group of naturally occurring minerals composed of long, thin fibers.
21. Where crops are planted along the contour lines of a slope.
24. a substance capable of causing cancer in living or increasing the risk of cancer development.
25. a plant growth primarily to protect and improve the soil rather than for harvest.

1. the physical material covering the Earth's surface.
2. a farming practice were two or more crops are grown simultaneously in the same field.
3. a farming technique were where different crops are planted in the same field over successive season or years
5. the presence of harmful or toxic substances in the environment.
6. The presence of harmful or excessive concentrations of pollutants in the air.
10. a substance that is toxic or harmful to nerve tissue or the nervous system.
11. a disease that has newly appeared in a population.
12. the accumulation of slats in the soil.
16. the mechanical manipulation of soil to prepare for planting .
17. The human activities and purpose for which land is utilized
22. a densely populated area.
23. a substance used to control, repel, or kill pests.