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| 7510297602 | Fixation | Atmospheric Nitrogen to Ammonium | 0 | |
| 7510317886 | Ammonification | Organic Molecules to Ammonium | 1 | |
| 7510345637 | Denitrification | Organic Molecules to Atmospheric Nitrogen | 2 | |
| 7510376477 | Assimilation | Nitrate and Nitrite to Organic Molecules | 3 | |
| 7514893702 | Nitrification | Nitrate and Nitrite to Ammonium | 4 | |
| 7572676264 | Sink | A reservoir that takes up a chemical element or compound from another part of its natural cycle | 5 | |
| 7572676265 | Source | Any process or activity through which greenhouse gases are released into the atmosphere | 6 | |
| 7572676266 | How plate tectonics, hydrologic and rock cycle are nutrient cycling | the evolution of rocks, largely proceeds from currents that largely arise out of the hydrologic cycle, and the chief driver of rock recycling is plate tectonics.c | 7 | |
| 7575357898 | Biogeography chemicals cycles | Pathway of elements more through, biota, soil, water and atmosphere | 8 | |
| 7575586928 | Symbiotic | A relationship of two species that live in close association with each other. Long term | 9 | |
| 7575586929 | Diatomic | Consisting of two atoms | 10 | |
| 7575586930 | Leaching | drain away from soil, ash, or similar material by the action of percolating liquid, especially rainwater. | 11 | |
| 7575586931 | Deposition | Process in which sediment is laid down in new locations. | 12 | |
| 7575586932 | Macromolecules | A very large organic molecule composed of many smaller molecules | 13 | |
| 7575586933 | Budget | An accounting of the income, use, and loss of energy especially in an ecosystem. | 14 |
