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Polar stratospheric cloud - Wikipedia
Polar stratospheric clouds (PSCs), also known as nacreous clouds (/ ˈ n eɪ k r i ə s /, from nacre, or mother of pearl, due to its iridescence), are clouds in the winter polar stratosphere at altitudes of 15,000–25,000 m (49,000–82,000 ft). They are best observed during civil twilight, when the Sun is between 1 and 6 degrees below the horizon, as well as in winter and in more northerly ...
Department of Chemistry - SHSU Online
Welcome to the Department of Chemistry. Sam Houston State University P.O. Box 2117 Huntsville, Texas 77341 Phone: (936) 294-1532 Fax: (936) 294-4996
Glossary of Terms: P - Physical Geography
Pacific High High pressure system that develops over the central Pacific Ocean near the Hawaiian Islands. Also called the Hawaiian High. Paleoclimate Climatic conditions in the geological past reconstructed from a direct or indirect data source.
The Ozone Hole
Ozone Destruction. NASA Earth Observatory (Illustration courtesy Barbara Summey, SSAI) Understanding Stratospheric Ozone Depletion . Our understanding of stratospheric ozone depletion has been obtained through a combination of laboratory studies, computer models, and atmospheric observations.
The Ozone Hole
The Ozone Hole 2017. Antarctic Situation at 2017 September 11 British Antarctic Survey Ozone Bulletin. Antarctic ozone today: The atmospheric circulation remains in its winter mode, with the polar vortex near its largest.
Eocene - Wikipedia
The Eocene (/ ˈ iː ə ˌ s iː n, ˈ iː oʊ-/) Epoch, lasting from , is a major division of the geologic timescale and the second epoch of the Paleogene Period in the Cenozoic Era. The Eocene spans the time from the end of the Paleocene Epoch to the beginning of the Oligocene Epoch. The start of the Eocene is marked by a brief period in which the concentration of the carbon isotope 13 C in ...
Top 10 Unusual but Fascinating Cloud Formations - Toptenz.net
What is the sky without little fluffy clouds? Boring if you ask me. A cloudless plain sky is like a garden without flowers.. Clouds can generally be classified by appearance – cumulus (heap), stratus (layer), cirrus (curl), nimbus (rain) – or by height of cloud base – high level, mid level, low level clouds and clouds with vertical development.
ozone depletion | Facts, Effects, & Solutions | Britannica.com
Ozone depletion: Ozone depletion, gradual thinning of Earth’s ozone layer caused by the release of chemical compounds containing gaseous chlorine or bromine from industry and other human activities. The thinning is most pronounced in the polar regions, especially over Antarctica.