6.A major regional or global biotic community, such as a grassland or desert, characterized chiefly by the dominant forms of plant life and the prevailing climate.
7.? Applyng this method to analyze the groundwater salinization features in Taklimakan Desert,lixiviation is proved to be the main salinization process of groundwater though there is an arid climate and a high evaporation.
8.It includes the volcanic rock mass of the Air, a small Sahelian pocket, isolated as regards its climate and flora and fauna, and situated in the Saharan desert of Tenere.
