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horizontal tunnels that are dug from the working shaft to the ore body in a mine.
a short way to represent the electron structure of an atom.
a material that resists the flow of electric current.
any different samples of a chemical compound will be made of the same elements (will have the...
if the equilibrium of a system is disturbed by a change in temperature, pressure or...
a measure of the amount of substance per unit volume. Unit: mol.dm-3