Zeugen - a table-shaped area of rock found in arid and semi-arid areas formed when more resistant rock is reduced at a slower rate than softer rocks around it under the effects of wind erosion.

Zipf, G.K. - author of the rank-size rule.

Zonal soil - soils that have been under development for a very long period of time and therefore show characteristics clearly attributable to the biome in which they are found.

Zooplankton - animal species of plankton.