Across
- 5. cycle the cycle of processes by which water circulates between the earth's oceans, atmosphere, and land
- 7. cycle substance turnover is a pathway by which a chemical substance moves through both the biotic (biosphere) and abiotic
- 8. nutrient is essential to understanding biological processes.
- 9. is the process where plants absorb water through the roots and then give off water vapor through pores in their leaves.
- 10. the process of turning from liquid into vapor.
- 12. cycle released into the atmosphere by photosynthetic organisms is taken up by aerobic organisms while the carbon dioxide released as a by-product of repiration is taken up for photosynthesis.
Down
- 1. a substance that provides nourishment essential for growth and the maintenance of life.
- 2. cycle the series of processes by which nitrogen and its compounds are interconverted in the environment and in living organisms, including nitrogen fixation and decomposition.
- 3. the loss or removal of nitrogen or nitrogen compounds; specifically :reduction of nitrates or nitrites commonly by bacteria
- 4. bloom, a rapid growth of microscopic algae or cyanobacteria in water, often resulting in a colored scum on the surface.
- 6. decompose through the action of bacteria and fungi.
- 11. productivity the rate at which energy is converted by photosynthetic and chemosynthetic autotrophs to organic substances