Chapter 25 Science
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14 terms
Terms | Definitions |
|---|---|
 abiotic | nonliving, physical features of the environment including air, water, sunlight, soil, temperature and climate. |
| atmosphere | air surrounding Earth, is made up of gases including 78% nitrogen, 21% oxygen, and 0.03% carbon dioxide. |
| biotic | features of the environment that are alive or were once alive |
| carbon cycle | model describing how carbon molecules move between the living and nonliving world. |
| chemosynthesis | process in which producers make energy-rich nutrient molecules from chemicals. |
| climate | average weather conditions of an area over time including wind, temperature and rainfall or other types of precipitation such as snow or sleet. |
| condensation | process that takes place when a gas changes to a liquid. |
| energy pyramid | model that shows the amount of energy available at each feeding level in an ecosystem. |
| evaporation | process that takes place when a liquid changes to a gas |
| food web | model that shows the complex feeding relationships among organisms in a community |
| nitrogen cycle | model describing how nitrogen moves from the atmosphere to the soil to living organisms and then back to the atmosphere. |
| nitrogen fixation | process in which some types of bacteria in the soil change nitrogen gas into a form of nitrogen that plants can use. |
| soil | mixture of mineral and rock particles, the remains of dead organisms, air, and water that forms the topmost layer of Earth's crust and supports plant growth. |
| water cycle | model describing how water moves from Earth's surface to the atmosphere and back to the surface again through evaporation, condensation, and precipitation. |
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