The atmosphere is a thin spherical evelop of gases surrounding the earth's surface. Its inner layer, troposphere, extends only about 17 Km. above sea level. This layer is called a breath zone and consisting mostly of a mixture of parmanant gases and variable gases about nitrogen, oxygen, and traces (remaining)of carbon dioxide, argon, water vapor, methane and other components.
Almost all of the earth's weather occurs and dynamic system in volved in the chemical cycling of the earth's vital nutrients. The second layer is stretching 17-48 Km. above the earth's surface, is the stratosphere or zone layer. Its lower portion contains enough ozone gas to filter out most of the sun's harmful.