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nonliving physical features of the enviorment


the air that surrounds the earth


the features of a enviorment that are alive or once alive


a mixture of minreal and rock particles


the area's average weather conditions


when liquid water changes into water vapor and enters the atmosphere


the process of changing gas to a liquid

water cycle

a model that describes how water moves from the surface of earth to the atmosphere

nitrogen fixation

types of soil bacteria can form nitrogen compunds plants need

nitrogen cycle

the transfer of nitrogen from the atmosphere, to the soil, to living organisms, and back to the atmosphere

carbon cycle

describes how carbon molecules move between the living and nonliving world


the production of energy-rich nutrient molecules fomr chemicals

food web

model that shows all the possible feeding relationships among organisms

energy pyramind

the amount of energy available at each feeding level in a ecosystem

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