landfill
A common method of disposing trash and garbage by burying it under layers of earth in low ground.
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Lethal dose (LD)
A scientific standard used to measure the potential of a given substance to cause death in humans. Lethal Dose standards use a benchmark known as LD50, or the amount of a compound in milligrams per kilogram of body weight needed to cause death in 50% of test animals exposed to this quantity.
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