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- 10:29, 9 October 2022 Hans.de.Gier talk contribs created page Pollution (Created page with "== What is pollution? == Pollution is the introduction of harmful materials into the environment. These harmful materials are called pollutants. Pollutants can be natural, such as volcanic ash. They can also be created by human activity, such as trash or runoff produced by factories. == What are the 4 types of pollution? == The major kinds of pollution, usually classified by environment, are: * air pollution * water pollution * land pollution. Modern society is also c...")
