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water cycle
Subject:
Physical Sciences

the natural circulation of water on, above or below the surface of the Earth.

water of crystallisation
Subject:
Physical Sciences

the total mass of water retained by certain salts at a given temperature.

weak acid
Subject:
Physical Sciences

acids that only partially ionise e.g. CHOOH.

weak base
Subject:
Physical Sciences

bases that only partially ionise e.g. H2O.