1/27/2024 0 Comments Free Sea Horizon![]() ![]() Recently, human activity has also contributed to atmospheric changes, such as global warming, ozone depletion and acid deposition. The atmosphere changed significantly over time, affected by many factors such as volcanism, life, and weathering. Įarth's early atmosphere consisted of gases in the solar nebula, primarily hydrogen. Within the atmosphere, air suitable for use in photosynthesis by terrestrial plants and breathing of terrestrial animals is found only in Earth's troposphere. Air composition, temperature, and atmospheric pressure vary with altitude. Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere. The atmosphere of Earth creates pressure, absorbs most meteoroids and ultraviolet solar radiation, warms the surface through heat retention ( greenhouse effect), allowing life and liquid water to exist on the Earth's surface, and reduces temperature extremes between day and night (the diurnal temperature variation).Īs of 2023, by mole fraction (i.e., by number of molecules), dry air contains 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases. The atmosphere of Earth is the layer of gases, known collectively as air, retained by Earth's gravity that surrounds the planet and forms its planetary atmosphere. Not to be confused with Air quality.īlue light is scattered more than other wavelengths by the gases in the atmosphere, surrounding Earth in a visibly blue layer at the stratosphere, above the clouds of the troposphere, when seen from space on board the ISS at an altitude of 335 km (208 mi) (the Moon is visible as a crescent in the far background). ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |