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
Last Day on Earth (The Walking Dead) 10 in his review and commented, "For all that "Last Day on Earth" was really about, and what was important about it, it went on too long. And then failed to deliver a satisfying exclamation point. Instead, we got another fake out/cliffhanger. A technique this show is absolutely over indulging in. Jeffrey Dean Morgan was terrific as Negan though." Zack Handlen of "The A.V. Club" gave the episode a C, the lowest grade given by the website for the show to date, faulting the episode for awkward, drawn-out writing and forced story arcs which couldn't maintain an atmosphere of suspense