Answer:Density is a characteristic property of a substance. ... The mass of atoms, their size, and how they are arranged determine the density of a substance. Density equals the mass of the substance divided by its volume; D = m/v. Objects with the same volume but different mass have different densities.
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there are types like oil pollution radioactive waste urban devlopement plastics
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Electromagnet is an electrical component that when powered emits a magnetic field based on the amount of current provided. this is the same principal that runs induction motors
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