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Corrosion

Corrosion is the reaction of a metal with another material. These reactions are usually with very low PH or acidic materials such as sulphuric acid or reactions with high ph or basic materials such as sodium hydroxide.

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Troposphere

... the Greek "tropos" for "turning" or "mixing". This region, constantly in motion, is the densest layer. Nitrogen and oxygen are the primary gases, within this region. ...