Atmosphere of Earth (see the temperature section, below). Because the general pattern of the temperature/altitude profile is constant and measurable by means of instrumented balloon soundings, the temperature behavior provides a useful metric to distinguish atmospheric layers. In this way, Earth's atmosphere can be divided (called atmospheric stratification) into five main layers. Excluding the exosphere, the atmosphere has four primary layers, which are the troposphere, stratosphere, mesosphere, and thermosphere. From highest to lowest, the five main layers are: The exosphere is the outermost layer of Earth's atmosphere (i.e. the upper limit of the atmosphere). It extends from the exobase, which is located at
A Planet Called Treason This mission is only the beginning of the adventure for Lanik, who discovers the secrets of the most powerful nations and at the same time gains additional abilities to save his people and determine the fate of his planet. Lanik travels to many of the regions of the planet Treason throughout the book, and discovers that those residing in different regions have different powers or capabilities. He first passes through the land of the Ku Kuei while on his way to Nkumai, learning that they can control the flow of time in a bubble extending out from themselves. When he