Read the given paragraph and answer the following questions.

Earth's atmosphere consists of several layers, each with distinct characteristics. The troposphere, extending up to 10 km, hosts nearly all weather and contains 99% of atmospheric water vapor. Above it, the stratosphere stretches to 50 km, containing the ozone layer, which shields life from harmful UV radiation. Commercial jets fly here for smoother rides. The mesosphere, reaching 85 km, is where most meteors burn up and has the coldest atmospheric temperatures. The thermosphere, extending to 600 km, absorbs high-energy radiation, with satellites orbiting and auroras occurring here. The exosphere is the outermost layer, reaching up to 10,000 km. Ozone depletion, caused by CFCs and HCFCs, is most severe over Antarctica.