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| The biosphere is the part of Earth and its atmosphere in which living. organisms exist. |
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| Biotic factors are things that are living or that were once living in the biosphere. |
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| Abiotic factors are the nonliving things in the biosphere. |
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| A system in which organisms and their environment interact. |
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| The water cycle is the movement of water throughout the biosphere. |
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| A community is all of the living things in an ecosytem. |
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| Organisms of the same species living in a community are called a poplulation. |
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| Population density is the number of individual organisms of one species in a community. |
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| Carrying capacity is the maximum number of organisms in a population that an environment can support over a long period of time. |
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| A habitat is the place in which an organism lives; the place where all of its needs are met. |
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| An organism's preferred habitat is the place where the organism has an advantage over other organisms. |
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| Much of life in a freshwater environment is Plankton, microscopic organisms that live near the surface of the water. |
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| A wetland is an area of land where the water level is near or above the ground surface for most of the year. |
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| Riparian vegetation includes all waterside plants that add nutrients to streams and rivers. |
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| Water hardness is the term used to describe the amount of the minerals magnesium and calcium in water. |
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| A pollutant is a substance or condition in the air, soil, or water that harms living things. |
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| Sediments are solid materials that settle to the bottom of a liquid. |
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| Acid rain is teh result of sulfur dioxide and nitrogen oxides reacting in the atmosphere with water and returning to earth. |
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Term
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Definition
| The pH scale is a scale that measures the acidity of a solution such as water. |
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