Why is there a danger of explotion in places such as coal mines where there are large quantities of powder, combustibe materials ​

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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some sources quote the lethal dose, for an average 170lbs opiate-naive individual is between 75 and 375 mg

answer; talc and gypsum;