Describe the nitrogen cycle and how it is affected by human activity. Nitrogen is converted from atmospheric nitrogen (N2) into usable forms, such as NO2-, in a process known as fixation. The majority of nitrogen is fixed by bacteria, most of which are symbiotic with plants.
Tumble polished unakite pebbles. First discovered in the United States in the Unakas mountains of North Carolina from which it gets its name, unakite is an altered granite composed of pink orthoclase feldspar, green epidote, and generally colorless quartz. It exists in various shades of green and pink and is usually mottled in appearance.
An Islamic healing philosophy that incorporates major elements of ancient Greek medicine (unani means âGreekâ in Arabic), which assumes four elementsâearth, fire, water, airâand four corresponding humours: Phlegm (balgham), Blood (dam), Yellow bile (safra) and Black bile (sauda), respectively; it also incorporates minor elements of ayurvedic medicine