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18.4
Ecosystem Recycling
| Question | Answer |
|---|---|
| biogeochemical cycle | substances such as water, carbon, nitrogen, calcium, and phosphorus each pass between the living and nonliving worlds |
| groundwater | water in the soil or in underground formations of porous rock |
| water cycle | the continuous movement of water between the atmosphere, the land, and the oceans |
| transpiration | the process by which water evaporates from the leaves of plants in terrestrial ecosystems |
| carbon cycle | the movement of carbon from the nonliving environment into living things and back |
| nitrogen cycle | the process in which nitrogen circulates among the air, soil, water, plants, and animals in an ecosystem |
| nitrogen fixation | the process by which gaseous nitrogen is cnverted into nitrates, compounds that organisms can use to make amino acids and other nitrogen-containing organic molecules |
| nitrogen-fixing bacteria | a bacterium that converts atmospheric nitrogen into ammonia |
| ammonification | the formation of ammonia compounds in the soil by the action of bacteria on decaying matter |
| nitrification | the process by which nitrites and nitrates are produced bacteria in the soil |
| denitrification | the liberation of nitrogen from nirogen-containing compounds by bacteria in the soil |
| phosphorus cycle | the cyclic movement of phosphorus in different chemical forms from the environment to organisms and then back to the environment |
Created by:
blehrner
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