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a person who carefully manages a resource by taking responsibility for their actions and educating others.

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An ecological footprint compares human demand on nature with the ability of Earth's ecosystems to regenerate those resources.

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species that occur naturally in an area.

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a species that has been introduced into an area (accidentally or purposely) where it did not exist before; often reproduces so aggressively that it replaces some of the original species.

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the complete disappearance of a species from anywhere on Earth.

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species that are at risk of becoming extinct due to either reduction in numbers or an  environmental threat.

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the variety of plant and animal life in an ecosystem.

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a model that shows the number of individuals at each level in a food chain or food web.

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the change in state of a substance from gas to liquid.

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water in the liquid or solid state that falls to Earth.

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the process in which a substance changes state from liquid to gas.

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The water cycle begins with evaporation. As the Sun's energy warms up oceans, lakes, and rivers, some of the water evaporates to form water vapour. Large amounts of water vapour also escape from plant leaves. The water vapour rises in the atmosphere, contracting as it cools to form tiny water droplets. The tiny water droplets that result from the condensation of water vapour form clouds. As more and more droplets condense, they fall back to Earth as rain or snow, also called precipitation. Precipitation can run off of the surface of Earth and into bodies of water. Precipitation may also seep into the ground and remain trapped there for years as groundwater. Groundwater also eventually seeps into large bodies of water. At any stage in the cycle, the water may evaporate back into the atmosphere.

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Plants use carbon dioxide in photosynthesis to produce sugars. 'When animals and other organisms break down these sugars to obtain energy, they produce water and carbon dioxide. Animals also release waste carbon dioxide when they exhale, or breathe out. When decomposers break down
dead plants and animals, they too release carbon dioxide. All of the carbon dioxide released into the air by these processes is available to plants for photosynthesis. The cycle starts again.

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something that can be maintained and used indefinitely.

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a pattern in nature that repeats over time.

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a system in which the amount of matter remains constant over time.

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succession that develops a community in an area after it
has been disturbed.

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Lichens are the first organisms to "colonize" the bare rock. They begin the process of building soil. Lichens use photosynthesis to make food and to grow, and they produce acids that help them to absorb nutrients from the rock and the air. These acids break down the rock into soil. Lichens pick up some of the newly formed soil particles and other bits of debris as the wind blows over them. Once lichens are thick enough, mosses can live in the area.

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succession that develops a community of plants and animals in an area where no living things existed before.

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a series of gradual changes that result in the replacement of one community of plants and animals by another.

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An organism that feeds on large parts of decaying plant and animal matter and on waste material.

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A group of carnivores that are called scavengers, feed on already dead animals.

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An individual plant, plant or a single-cell life form. Organisms in a natural community plays different roles within their ecosystem. An organism's role within an ecosystem depends on how it obtains it's food. The way in which an organism obtains food also affects its interactions with other organisms in the ecosystem.

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Photosynthesis is a chemical reaction that takes place in the green leaves when the Sun's light is present, The green color visible in most leaves is a compound called chlorophyll, which is needed in the chemical reaction.

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A community is made up of populations of different species that live and interact in their habitat. The interactions of the population with each other and the local abiotic elements make up the ecosystem.

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Species are the most closely related groups of living things in an ecosystem. The members of the species can reproduce with each other and their offspring can reproduce.

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Population are groups of individuals that belong to the same species and live in the same area at the same time.

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photosynthesis: a process by which plants use water, carbon dioxide, and sunlight to produce sugars (food)

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dēkəmˈpōzər/

noun
An organism, especially a soil bacterium, fungus, or invertebrate, that decomposes organic material.

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An energy pyramid is a graphical model of energy flow in a community. The different levels represent different groups of organisms that might compose a food chain.

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(kən-s 'mər)
A heterotrophic organism that feeds on other organisms in a food chain.

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An organism, either a green plant or bacterium, which is part of the first level of a food chain.

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ˌābīˈädik/

adjective

Physical rather than biological; not derived from living organisms.

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bīˈätik/

adjective

Of, relating to, or resulting from living things, especially in their ecological relations.

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noun ECOLOGY

plural noun: food webs

A system of interlocking and interdependent food chains.

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food chain

noun

plural noun: food chains

The series of organisms each dependent on next as a source of food.