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horizontal tunnels that are dug from the working shaft to the ore body in a mine.
the time required for half the atoms present in an object have undergone radioactive decay and...
a chemical cell in which electrical energy from a battery is used to produce chemical reactions...
a diagram that shows the electrons in the outermost occupied shell of an atom as dots or crosses...
attracted to iron, cobalt or nickel, or forms a permanent or temporary magnetic field.