Cadium - a soft poisonous metal that is used in batteries and in the protective shields in nuclear reactors. It is a chemical element, Magnesium - a common silver-white metal that burns with a bright white flame. It is a chemical element, I class of purity - the cleanest waters, suitable directly for supplying the population with drinking water, living fish poorly resistant to pollution, II class of purity - water that is suitable for recreational purposes and for watering animals,, III class of purity - water suitable for irrigation of fields and industrial purposes that do not require drinking water quality, pesticide - a chemical substance used to kill insects and small animals that destroy crops, agricultural pollution - the top source of contamination in rivers and streams, sewage - the mixture of waste from the human body and used water, that is carried away from houses by pipes under the ground, pollution - the process of making air, water, soil etc dangerously dirty and not suitable for people to use, or the state of being dangerously dirty, radioactive waste - harmful radioactive substances that remain after energy has been produced in a nuclear reactor,

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