State of Research on the Snowball Earth Hypothesis Essay -- essays res

State of Research on the increase Earth HypothesisThe snowball Earth Hypothesis also cognise as the Varangia glaciation is a guesswork presented in 2001 by Geologist Paul Hoffman. (Wikipedia, 2002)The hypothesis purposes that 540 million years ago during the Neoproterozic, a meter thick of crosspatch covered the oceans and glaciers the continents for 100 million years. Al put ono when ice and snow strike solar radiation into space, in absents of greenhouse shove alonges, which dont exist within the air travel, heat up therefore escapes the planet. A condition of temperature disequilibrium occurs, when freezing cold reaches a state, the mode never warms to normal, and cold freezes the hemisphere and buries it under massive glaciation. The glaciers begin when a green house gas, carbon dioxide, is depleted from erosion of silicates. Once the ambiance is depleted of carbon dioxide, it can not absorb solar radiation. The worldwide tempertures drops to cold and glaciation occurs , glaciation continues, temperature gradients drop further to colder, below freezing, cold is irreversible, glaciers reflect solar radiation into space. The lack of atmospheric carbon dioxide prevented greenhouse from occurring, earth is fixed until the hemisphere is totally glaciated. (Hoffman, 1998)Deglaciation can occur when volcanic eruptions saturate the atmosphere with carbon dioxide gas and resume the greenhouse effect on climate. solar radiation is absorbed by greenhouse gases, rewarming the climate. A dramatic amplification of the biosphere occurred. (Cold) History of Snowball Earth HypothesisA manoeuver toppled during a hurricane. A 700 million year old rock bed was discovered in Appalachia. The rock, diamictite consisted of basalt -size cobbles mixed with a slurry of fine silt and sand. The vicinity consisting of Appalachian Blue Ridge range, Sharp Top mountain had once bordered a seaway cutting through Rhodina, a gargantuan continent that included most of the world s land. Sharp Top contained signs of tides, indicating the glacier had streached down to the sea. During this time, Virginia was 15 to 30 of the equator. Scientist cherished to know why ice was on the equator during the Neoproterozoic era. (Monastersky,1998)The team of scientists consisted of a biogeologist, geochemist, and architectonic geologist with the common goal of understanding the coevolution of life and environ... ...excursions a record of gas hydrate destabilization following Earths coldest intervals? Geology 286-287Hoffman, Paul F. Schrag, Daniel P. Snowball Earth scientific America 21 Jan 2000 scientific American Online. Online 31 Mar 2003Kennedy, Martin J. Christie - Blick, Nicholas Prave, Anthony R. (2001) degree centigrade isotopic composition of Neoproterozoic glacial carbonates as a test of paleoceanographic models for Snowball Earth phenomena. Geology 1135-1138Kennedy, Martin J. Runneger, Bruce Prave, Anthony R. Hoffmann, K -H. Arthur, Michael A. (1998) Two or four Neoproterozoic glaciations? Geology 1059-1063Knoll, Andy The Planet ary mise en scene of Biological Evolution Lead Teams Online. NASA Astrobiology Institute 2Apr 2003Monastersky, Richard, Popsicle Planet, The queen of all ice ages may have spurred animal evolution 22Aug 1998 experience News Online Online. Science Service 2 Apr 2003Simpson, Sarah Triggering a Snowball, Did Methane addiction develop Off Earths Greastest Ice Ages? Scientific America 16 Sept 2001 Scientific American Online. Online 1 Apr 2003Wikipedia, the free encyclopedia. Snowball Earth 29 Sept. 2002. Online. Wikipedia lucre 31 Mar 2002