ATMOSPHERE: Origin, Composition and Structure, Atmospheric particles, Oxygen Consumers, Aerosols, Troposphere, Stratosphere, and Thermosphere
A band of gases encircling the Earth’s surface is one of the four elements of the ecosystem (the other three being the biosphere, hydrosphere, and lithosphere). Within 20 miles of the surface of the earth, 99 percent of its mass is concentrated. The atmosphere just disappears into space, having no outer bound.