Pollution, The introduction of harmful materials into the environment, pollutants, These can be natural, such as volcanic ash. They can also be created by human activity, such as trash or runoff produced by factories., Air, ----------- and water currents carry pollution., Smoke, when emitted from a factory it can drift from one country to another., three, There are -------- major types of pollution, visible, Sometimes, air pollution is-----------. A person can see dark smoke pour from the exhaust pipes of large trucks or factories, for example. More often, however, air pollution is invisible., Smog, This makes breathing difficult, especially for children and older adults., acids, When air pollutants such as nitrogen oxide and sulfur dioxide mix with moisture, they change into ----------. They then fall back to earth as acid rain., Greenhouse, These gases such as carbon dioxide and methane occur naturally in the atmosphere., water, These pollution will looks muddy, smells bad, and has garbage floating in it. It can also looks clean, but is filled with harmful chemicals you can’t see or smell., Land, Mining sometimes leaves the soil contaminated with dangerous chemicals. Name the pollution this create ...

Pollution

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