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water droplets that combine with one another, grow too heavy to stay in the air, and fall to the ground as snow, rain or hail.
a solution to which a little base has been added to a lot of water.
the energy level, or shell, of an atom that contains the valence electrons.
SystÃ¨me International dâUnitÃ©s. Internationally agreed coherent system of units: distance in...
a salt that can neutralise a base.
the stratosphere extends from a height of 10 km to 50 km above the surface of the Earth.