. Give reason
a. Lustrousmaterials look dull aftersometime.
b. why are quilts stuffed with cotton?. Give reason. Give reason
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a)=Some metals often lose their shine and appear dull, because of the action of air and moisture on them. Some metals as a result of oxidation with the atmospheric oxygen form oxides and by which their appearance becomes dull.
b)=Quilts are filled with fluffy cotton because air is trapped in the fine pores of cotton. As cotton and air are the insulators of heat. They check heat from our body to escape and thus keep us warm.
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