nonliving, physical features of the enviorment, including air, water, sunlight, soil, and climate.
air surounding Earth; is made up of gases, including 78% nitrogen, 21% oxygen, and 0.03% carbon dioxide
features of the enviorments that are alive or were alive at some point in time.
model describing how carbon molecules move between the living and nonliving world.
process in which producers make energy rich nutrient molecules from chemicals.
average weather conditions of an area over time including wind, temperature, and rainfall or other types of percipitation such as snow or sleet.
process that takes place when a gas changes to a liquid.
model that shows the amount of energy avalible at each feeding level in an ecosystem.
process that takes place when a liquid turns into a gas.
model that shows the complex feeding relationships among organisms in a community.
model describing how nitrogen moves from the atmosphere to the soil, to living organisms, and then back to the atmosphere.
process in which some types of bacteria in the soil change nitrogen gas into a form of nitrogen that plants can use.
mixture of minerals and rock particles, remains of dead organisms, air, and water that forms the top layer of earth's crust and supports plant growth.
model describing how water moves from Earth's surface to the atmosphere and back to the surface again through evaporation, condensation, and precipitation.