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Here are some facts about these layers. Necessary cookies are absolutely essential for the website to function properly. The Mesosphere, like the troposphere layer, has a decrease in temperature with altitude because of the decreases in the density of the air molecules. When extraterrestrial objects (meteoroids, space shuttles) enter the atmosphere, they start heating up in the mesosphere. The interior of Earth is divided into 5 important layers as crust, upper mantle, lower mantle, outer core, and inner core. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. The main most important features in this region are strong zonal (East-West) winds, atmospheric tides, internal atmospheric gravity waves (commonly called "gravity waves"), and planetary waves. In the mesosphere, gravity-wave amplitudes can become so large that the waves become unstable and dissipate. (Image credits: NASA, Astronaut Ron Garan from the International Space Station). These waves then move upward, like water waves moving in the sea. iron and potassium, exist in the upper mesosphere/lower thermosphere region as well. Earth's atmosphere is our natural shield against the harsh conditions of spaceincluding everything from meteors and falling satellites to deadly ultraviolet radiation from the sun. Mesosphere It is also the layer where the suns UV radiation strikes the planet. It is the lowest layer of the atmosphere, containing about 75 percent of the total air. Layers It continued to ascend, through the upper reaches of the stratosphere into the mesosphere, which includes the coldest part of the atmosphere. The mesosphere is located between fifty and eighty kilometers above the surface of the Earth.