Atmosphere Atmosphere An atmosphere (from Modern Greek ἀτμός "(atmos)", meaning 'vapour', and σφαῖρα "(sphaira)", meaning 'sphere') is a layer or a set of layers of gases surrounding a planet or other material body, that is held in place by the gravity of that body. An atmosphere is more likely to be retained if the gravity it is subject to is high and the temperature of the atmosphere is low. The atmosphere of Earth is composed of nitrogen (about 78%), oxygen (about 21%), argon (about 0.9%) , carbon dioxide (0.03%) and other gases in trace amounts. Oxygen is used by most organisms
Most common words in Spanish includes samples from all Spanish-speaking countries. The list of "1000 most frequent word forms" comes from an analysis of CREA version 3.2. Plurals, verb conjugations, and other inflections are ranked separately. Homonyms, however, are not distinguished from one another. CREA 3.2 was published in June 2008. In 2006, Mark Davies, an associate professor of linguistics at Brigham Young University, published his estimate of the 5000 most common words in Modern Spanish. To make this list, he compiled samples only from 20th-century sources—especially from the years 1970 to 2000. Most of the sources are from the 1990s. Of the 20 million