Atmosphere - National Geographic Society
WEBOct 19, 2023 · Earth’s atmosphere is composed of about 78 percent nitrogen, 21 percent oxygen, 0.9 percent argon, and 0.1 percent other gases. Trace amounts of carbon dioxide, methane, water vapor, and neon are some of the other gases that make up the remaining 0.1 percent. The atmosphere is divided into
Atmosphere | Definition, Layers, & Facts | Britannica
WEBApr 18, 2024 · atmosphere, the gas and aerosol envelope that extends from the ocean, land, and ice -covered surface of a planet outward into space. The density of the atmosphere decreases outward, because the gravitational attraction of the planet, which pulls the gases and aerosols (microscopic suspended particles of dust, soot, smoke, or …
Atmosphere of Earth - Wikipedia
WEBThe atmosphere of Earth creates pressure, absorbs most meteoroids and ultraviolet solar radiation, warms the surface through heat retention (greenhouse effect), and reduces temperature extremes between day and night (the diurnal temperature variation), maintaining conditions allowing life and liquid water to exist on the Earth's surface.
What Is the Atmosphere? | Center for Science Education
WEBThe atmosphere is a mixture of gases that surrounds the Earth. It helps make life possible by providing us with air to breathe, shielding us from harmful ultraviolet (UV) radiation coming from the Sun, trapping heat to warm the planet, and preventing extreme temperature differences between day and night.
Atmosphere - Wikipedia
WEBAn atmosphere (from Ancient Greek ἀτμός (atmós) 'vapour, steam', and σφαῖρα (sphaîra) 'sphere') is a layer of gasses that envelop an astronomical object, held in place by the gravity of the object. A planet retains an atmosphere when the gravity is great and the temperature of the atmosphere is low.
Layers of the Atmosphere - National Oceanic and Atmospheric Administration
WEBJan 2, 2024 · Exosphere. This is the outermost layer of the atmosphere. It extends from about 375 miles (600 km) to 6,200 miles (10,000 km) above the earth. In this layer, atoms and molecules escape into space and satellites orbit the earth. At the bottom of the exosphere is a transition layer called the thermopause.
Parts of the Atmosphere - National Geographic Society
WEBOct 19, 2023 · Vocabulary. We live at the bottom of an invisible ocean called the atmosphere, a layer of gases surrounding our planet. Nitrogen and oxygen account for 99 percent of the gases in dry air, with argon, carbon dioxide, helium, neon, and other gases making up minute port ions. Water vapor and dust are also part of Earth ’s atmosphere.
Atmosphere Definition & Meaning - Merriam-Webster
WEBThe meaning of ATMOSPHERE is the gaseous envelope of a celestial body (such as a planet). How to use atmosphere in a sentence.
ATMOSPHERE | English meaning - Cambridge Dictionary
WEBATMOSPHERE definition: 1. the mixture of gases around the earth: 2. a mixture of gases that surrounds any planet: 3. the…. Learn more.
Earth's atmosphere (article) | Khan Academy
WEBThe five principal layers of the atmosphere are the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. Troposphere: The troposphere is the layer closest to Earth. It is the densest layer (i.e., contains the most air particles), and is where most of Earth’s weather and cloud formation occurs. The troposphere is heated ...
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