Ozone–oxygen cycle Ozone–oxygen cycle The ozone–oxygen cycle is the process by which ozone is continually regenerated in Earth's stratosphere, converting ultraviolet radiation (UV) into heat. In 1930 Sydney Chapman resolved the chemistry involved. The process is commonly called the Chapman cycle by atmospheric scientists. Most of the ozone production occurs in the tropical upper stratosphere and mesosphere. The total mass of ozone produced per day over the globe is about 400 million metric tons. The global mass of ozone is relatively constant at about 3 billion metric tons, meaning the Sun produces about 12% of the ozone layer each day. And if
The Languages of Tolkien's Middle-earth are all the languages in "The Lord of the Rings", except for Entish (of which no real examples are given; the closest we get is Elvish words strung together in an Entish manner, a sort of Ent pidgin). The Languages of Tolkien's Middle-earth The Languages of Tolkien's Middle-earth is a book on the languages of Middle-earth by Ruth S. Noel. The first edition, entitled "The Languages of Middle-earth", was published in 1974 by Mirage Press, Baltimore. The revised version was published in 1980 by Houghton Mifflin. Ruth S. Noel, also known as Atanielle Annyn Noel, is the author of "The