Nutrient cycle

2. a source of phosphorus in water comes from what?
7. mining and burning of fossil fuels, cleaning of land, use fertilizers these are examples of what classification?
9. too much phosphorus in water leads to what?
10. what nutrient is contained mostly in rocks and minerals?
13. what is within each of the cycles water, carbon, nitrogen, phosphorus?
14. what is the process in which element, chemical compounds, and other forms of matter are passed from one organism to another and from one part of the biosphere to another?
15. animals use oxygen in the process of what to make more co2?
16. higher organisms use nitrogen to make what?
17. phosphorus is an essential for life it makes up important chemicals like what?
19. what do humans add into the ground which runs into water?
20. animal waste decay by the action of bacteria which creates what?

1. what special bacteria can directly use nitrogen in out atmosphere and fix it so other organisms can benefit?
3. what do plants use co2 to make sugar and oxygen in the process of what?
4. what is the main regulator of co2 in the atmosphere because co2 dissolves easily in it?
5. what is the process of bacteria in soil breaking down the ammonia into the gaseous form of nitrogen?
6. what made up of 78% nitrogen gas?
8. every what needs nutrients to carry out life functions?
11. what is another natural source for co2
12. phosphorus in soils can be washed away into what?
18. what is the chemical substance that an organism needs to sustain life?