Unit 8 & 9 Key Terms

1. Partly decomposed organic matter
5. the accumulation of substances, such as pesticides, or other organic chemicals in an organism
8. the rearing of aquatic animals or the cultivation of aquatic plants for food
9. the cultivation of fish or other marine life for food
10. a substance required in relatively small, commonly referred to as vitamins and minerals.
13. process by which fertile land becomes desert, typically as a result of drought, deforestation, or inappropriate agriculture
14. providing water other than precipitation to crops
15. Organisms that have had their DNA modified
16. a substance used for destroying insects or other organisms harmful that may be harmful to agricultural plants.
18. to graze so heavily that the vegetation is damaged and the ground becomes liable to erosion.
20. the cultivation of a single crop in a given area

2. a substance required in relatively large amounts, namely carbohydrates, protein, and fat..
3. an aquatic area with little oxygen and thus, little life
4. the concentration of toxins in an organism as a result of its ingesting other plants or animals in which the toxins are more widely disbursed
6. Soil with an even mixture of particle sizes
7. excessive richness of nutrients in a body of water, frequently due to runoff from the land, which causes a dense growth of plant life and death of animal life from lack of oxygen
11. Breakdown of waste, organisms, and organic material into simple molecules
12. Physical and chemical breaking of rocks and minerals into smaller pieces
17. Kills plants
19. Plants that destroy other plants