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 ..,

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