Z-Z

Absorption trench. They are partitioned channels, at regular Intervalores, constituted in watersheds with higher inclinations 15%, made across the slope and are designed to retain precipitation water converted to runoff before it acquires sufficient velocity to carry away the finer soil particles. They do not modify the slope of the terrain, but the effective length of the slope, by sectioning the total runoff space into several portions. They are suitable for regions with low rainfall, since the precipitation water retained in them later infiltrates.
Zinc. chemical element of group VIII of the periodic table. Atomic number 30, atomic mass 63.37. It is a dense metal, present in nature in minerals such as blende, smithsonite and calamine. Has industrial applications (galvanized, alloys, paintings, etc.). It is an essential micronutrient. Zinc salts are toxic in high concentrations. Zn symbol.
Buffer or buffer zone: Certain terrestrial or aquatic areas located around others that they protect, regulating, resisting, absorbing or excluding undesirable developments, as well as other types of human intrusions.
pelagic zone. Area of ​​the open sea or lakes where plankton and nekton species live in water as opposed to species that live on the seabed or in lakes.
Zoogeografía. Science that studies the distribution of animals and its possible causes in time and space.