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polyvinyl chloride, a white material often used in paints.
the process by which nitrogen passes through the ecosystem.
a vertical column of elements in the periodic table which have similar properties.
the separation of a dye into the different colours that make up that dye, as a result of the...
the sum of the number of protons and neutrons (the nucleons) in the nucleus of an atom. It...
the part of the Earth and its atmosphere in which life can exist.