Nerium oleander /ËnÉªÉriÉm ËoÊliË.Ã¦ndÉr/[3] is a shrub or small tree in the dogbane family Apocynaceae, toxic in all its parts. It is the only species currently classified in the genus Nerium.
Troposphere. The troposphere (from Greek: tropein-to change, circulate or mix) is the lowermost layer of the Earth's atmosphere. Most of the weather phenomena, systems, convection, turbulence and clouds occur in this layer, although some may extend into the lower portion of the stratosphere.emperature and water vapor content in the troposphere decrease rapidly with altitude and thus most of the water vapour in the troposphere is concentrated in the lower, warmer zone. Water vapor concentrations vary with latitude.
troÂ·poÂ·sphere. The lowest region of the atmosphere, bounded by the Earth's surface and the tropopause and characterized by temperatures that decrease with increasing altitude. Weather and most cloud formations occur in the troposphere.he lower layers of atmosphere, in which the change of temperature with height is relatively large. It is the region where clouds form, convection is active, and mixing is continuous and more or less complete. See also atmosphere.