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zeolite facies	The metamorphic facies just above diagenetic conditions, under which zeolite minerals form.
zone of ablation	The area of a glacier in which ablation (melting, sublimation, calving) subtracts from the glacier.
zone of accumulation	(1) The layer of regolith in which new minerals precipitate out of water passing through, thus leaving behind a load of fine clay; (2) the area of a glacier in which snowfall adds to the glacier.
zone of aeration	Unsaturated zone.
zone of leaching	The layer of regolith in which water dissolves ions and picks up very fine clay; these materials are then carried downward by infiltrating water.