atmospheric structureThe gaseous area surrounding the planet is divided into several concentric spherical strata (layers, like shells) separated by narrow transition zones. The boundaries are know as "pause". More than 99% of the total atmospheric mass is concentrated in the first 40 km from the Earth's surface. Atmospheric layers are characterized by differences in chemical composition that produce variations in temperature
economic structureThe underlying framework, including transportation and communications systems, industrial facilities, education and technology, that enables a country or region to produce goods, services and other resources with exchange value