Raw materials - Those in natural state, Processed materials - Material refimed or built by humans , Optical properties - How materials behave when light touches them, Thermal conductivity - Some materials has the ability of conduct heat, Types of chemical properties - Oxidation, Ecological properties - Recyclr,Toxic,Biodegrable, What does manufactured and raw means? - The food hasn't been processed by cooking, Types of raw materials - Animal,vegetable,minerals, Properties of materials - physical,chemical,ecological, Types of physical materials - Hardness,touchness,electrical conductivity,optical properties,thermal condictivity,

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