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Вопрос		Ответ
Gypsym definition начать обучение		soft white or gray material consisting of hydrated calcium sulphate
Glass definition начать обучение		hard, brittle substance tipically transparent or translucent mainly made of silicon dioxide
Limestone definiton начать обучение		sedimentary rock composed mainly of calcium carbonate
Gypsum varieties начать обучение		anhydrite, alabaster, selenite
Glass varieties начать обучение		soda-lime, crystal, bronosilicate
Limestone varieties начать обучение		marble, chalk, dolomite

Gypsum, Limestone, Glass