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the stratosphere extends from a height of 10 km to 50 km above the surface of the Earth.
the temperature at which a substance changes phase from a solid to a liquid at a specific or...
separate a solute, such as salt, from a solution, such as water.
a solvent able to dissolve a large number of different chemical compounds. Water is the...
an electron pair in which each atom provides one electron for the bonding pair.