Pollution - The addition of harmful materials to the environment., Resources - Things found in nature that are useful to organisms., Recycle - To collect old materials, process them, and make new items., Reduce - To make less and/or decrease the use of a resource or product., Reuse - To use an object again in the same form., Biodegradable - Materials that break down easily in the environment., Non-Biodegradable - Materials that do not break down easily in the environment., Conservation - To protect and manage the environment and natural resources., Acid Rain - Rain in any other from of precipitation that contains acid from certain pollutants in the air., Extinction - Occurs when an animal no longer exists because all of its species has died out completely.,

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