chemical - Involving or resulting from a reaction between two or more substances, contraction - The act of becoming smaller or shorter, erosion - The gradual destruction and removal of rock and soil in a particular area by rivers, the sea, and weather, expansion - The process of becoming greater in size, number or amount, fragmentation - The process of becoming smaller separate pieces, mechanical - Used for describing an object that has parts that move when it’s working, pollutant - Substances that pollute the environment, especially gases from vehicles and poisonous chemicals produced by waste by industrial processes, thermal - Related to or caused by heat or by changes in temperature,

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