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horizontal tunnels that are dug from the working shaft to the ore body in a mine.
horizontal rows of elements in the periodic table that are arranged according to their atomic...
the energy that objects or particles have as a result of their motion.
a solvent able to dissolve a large number of different chemical compounds. Water is the...
compounds that have different structural formulae but the same molecular formula.
a substance that can accept a proton in an acid-base reaction.