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Z


zone of ablation
The part of a glacier in which there is greater overall loss than gain in volume. A zone of ablation can be identified in the summer by an expanse of bare ice. See also zone of accumulation.
zone of accumulation
The part of a glacier in which there is greater overall gain than loss in volume. A zone of accumulation can be identified by a blanket of snow that survives summer melting. See also zone of ablation.
zone of aeration
A region below the Earth's surface that is marked by the presence of both water and air in the pores of rocks and soil. Also called aeration zone.
zone of saturation
A region that lies below the zone of aeration and is marked by the presence of water and the absence of air in the pores of rocks and soil.

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