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The method by which certain weedkillers and pesticides affect only what they come in direct contact with.
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|Noun||1.||contact action - acceleration of a chemical reaction induced the presence of material that is chemically unchanged at the end of the reaction; "of the top 50 commodity chemicals, 30 are created directly by catalysis and another 6 are made from raw materials that are catalytically produced"|
autocatalysis - catalysis in which the catalyst is one of the products of the reaction