The document discusses the five layers of Earth's atmosphere from the surface outwards: 1. The troposphere extends from the surface to 16km altitude. Weather occurs in this layer and temperature decreases with altitude. Harmful ozone and smog are found here. 2. The stratosphere extends from 16km to 50km altitude. Temperature increases with altitude in this layer and protective ozone is found at the top. Jet streams are located at the base. 3. The mesosphere extends from 50km to 90km altitude. Temperature decreases with altitude in this layer, making it the coldest. Meteors burn up in the mesosphere. 4. The thermosphere extends from 90km