a model that estimates how much water enters and leaves a particular area, and through which mechanisms (R1)
Wayfinder
in traditional Polynesian voyaging, the person who navigates the canoe using no instruments (M1)
Windward ability
the capacity of a sailing vessel to sail into the wind (M1)
Zonation
the distribution of plants and animals according to environmental conditions, generally in a pattern of vertical banding (M3)
Zooplankton
plankton composed of tiny animals (M2)
Zooxanthellae
single-celled organisms that live in the tissue of corals and provide energy to the corals (M2)