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==Key Stage 3==
===Meaning===
[[File:RustingGears.png|right|300px|thumb|[[Rusting]] is a form of [[corrosion]].]]
[[Corrosion]] is when a [[material]] is worn down by [[Chemical Reaction|chemical reaction]]s with [[substance]]s in the environment.
===About Corrosion===
: [[Corrosion]] is commonly caused by [[Water]], [[Oxygen]] and [[Acid]]s in the environment.
: [[Metal]]s and [[stone]] (such as [[limestone]], [[marble]] and [[chalk]]) are the most commonly '''corroded''' [[material]]s.: More [[Reactivity Series|reactive]] [[metal]]s are more easily '''corroded'''. ===Examples==={| class="wikitable"|-|[[File:RustingGears.png|center|200px]]|[[File:CorrosionCopper.png|center|200px]]|[[File:CorrosionStatue.png|center|200px]]|-| style="height:20px; width:200px; text-align:center;" |The [[corrosion]] of [[Iron]] forms brown [[Iron Oxide]], known as [[Rusting|rust]].| style="height:20px; width:200px; text-align:center;" |The [[corrosion]] of [[Copper]] forms green [[Copper Carbonate]].| style="height:20px; width:200px; text-align:center;" |This statue is made of [[Limestone]] which is mostly [[Calcium Carbonate]]. It is '''corroded''' by [[Acid Rain]] to form [[soluble]] [[salt]]s which wash away.|}
===Preventing and Reducing Corrosion===