Que- How old are Harappa cities believed to be? 2 points 3700 years ago 8000 years ago Ο Ο Ο Ο 1000 year ago 4700 years ago
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Magnesium gets covered with a layer of magnesium oxide when kept in air for a long time. This layer hinders the burning of magnesium. Hence, it is to be cleaned before burning.
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4700 years ago
Existed around 2500 BCE.
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