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- Zonal
- Movement of wind or ocean waters in a direction that is roughly parallel to the lines of latitude.
- Zone of Ablation
- Area of a glacier where losses of ice from melting, evaporation, and sublimation exceed additions of snow annually.
- Zone of Accumulation
- Area of a glacier where additions of snow exceed losses of ice from melting, evaporation, and sublimation.
- Zone of Aeration
- Horizontal zone that extends from the top of the water table to the ground surface. Soil and rock pore spaces in this zone may and may not have water.
- Zone of Saturation
- Groundwater zone within the Earth's bedrock where all available pores spaces are filled by water. Found beneath the water table.
- Zooplankton
- Small heterotrophic organisms found inhabiting aquatic ecosystems. Also see plankton and phytoplankton.