Science

4. an increase in BOD and a decrease in DO in aquatic waterways due to run-off of fertilizers or sewage wastes
7. Retention ponds and Overseeding and Silt screens
9. Leaching and illuviation and decomposition
10. The loss of topsoil by wind or water
14. the best soil for Agricultural yield
16. This mineral is found in DNA & ATP & teeth
17. Plants add oxygen by photosynthesis
19. loss of what leads to broken bird eggs?
20. Acidic soil is caused by:
21. Evaporation and Condensation and precipitation

1. no oxygen and dead zones in the ocean
2. This mineral forms Proteins & hormones Is also a fertilizer that Contributes to eutrophication
3. are returned to The soil for plant uptake
5. No till farming and Contour farming and Terracing and Crop rotation
6. Created by microbes consuming dead algae
8. This is created by Heavy rain & leads to the Problem of soil erosion & eutrophication
11. Silt and Sand or clay
12. This mineral is not a gas and cycles very slowly and is found in rock
13. This mineral forms fossil fuels like coal and oil and natural gas
15. Layer of soil where organic Debris is decomposed &
18. what is the main concern of runoff in lakes and rivers? (What’s “running off”?)