Shiva Hypothesis Causes There is still debate about the causes of all mass extinctions. In general, large extinctions may result when a biosphere under long-term stress undergoes a short-term shock. High diversity leads to a persistent increase in extinction rate; low diversity to a persistent increase in origination rate. These presumably ecologically controlled relationships likely amplify smaller perturbations meteorite impacts, etc. It may be necessary to consider combinations of causes. For example the marine aspect of the end-Cretaceous extinction appears to have been caused by several processes which partially overlapped in time and may have had different levels of significance in different parts of the world. Most widely supported explanations Macleod  summarized the relationship between mass extinctions and events which are most often cited as causes of mass extinctions, using data from Courtillot et al.
The chassis was that of the T Initial design work of a prototype U assault gun, armed with the mm howitzer and built on the T medium tank, was completed in August The project emphasized minimizing modifications to the platform and the howitzer. It used the same chassis, superstructure, engine and transmission and was armed with a new mm M S howitzer. SU production began in December with 27 vehicles built that month.
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Xenon is used in flash lamps  and arc lamps ,  and as a general anesthetic. More than 40 unstable xenon isotopes undergo radioactive decay , and the isotope ratios of xenon are an important tool for studying the early history of the Solar System. They found xenon in the residue left over from evaporating components of liquid air. This led him to the invention of the xenon flash lamp in which light is generated by passing brief electric current through a tube filled with xenon gas.
In , Edgerton was able to generate flashes as brief as one microsecond with this method. He tested the effects of varying the breathing mixtures on his subjects, and discovered that this caused the divers to perceive a change in depth. From his results, he deduced that xenon gas could serve as an anesthetic.
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Thousands of genera Phanerozoic biodiversity as shown by the fossil record The gaps between mass extinctions appear to be becoming longer, while the average and background rates of extinction are decreasing. Mass extinctions are thought to result when a long-term stress is compounded by a short term shock. Both of these phenomena could be explained in one or more ways: So paleontologists have mistakenly assigned parts of the same organism to different genera which were often defined solely to accommodate these finds an example is the story of Anomalocaris.
The risk of this mistake is higher for older fossils because these are often unlike parts of any living organism. Many of the"superfluous” genera are represented by fragments which are not found again and the"superfluous” genera appear to become extinct very quickly. Martin , has argued that the oceans have become more hospitable to life over the last M years and less vulnerable to mass extinctions: In general, large extinctions may result when a biosphere under long-term stress undergoes a short-term shock.
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In general, large extinctions may result when a biosphere under long-term stress undergoes a short-term shock. High diversity leads to a persistent increase in extinction rate; low diversity to a persistent increase in origination rate. These presumably ecologically controlled relationships likely amplify smaller perturbations asteroid impacts, etc.
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As we approach that anniversary date, we encourage state and local clubs to commemorate the day in some way, perhaps with a tournament or an educational program about chess in their communities. Zonal president in FIDE. National Chess Day began in South Carolina. It was created by the late Bill Dodgen, who was president of the South Carolina Chess Association for a number of years. It was originally a state chess day in South Carolina, but Bill quickly expanded it to a nationwide effort and was appointed National Chess Day chairman.
This is a great opportunity to expand chess awareness. Chess Hall of Fame:
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Badlands near Drumheller , Alberta , where erosion has exposed the K—Pg boundary Trilobites were highly successful marine animals until the Permian—Triassic extinction event wiped them all out In a landmark paper published in , Jack Sepkoski and David M. Raup identified five mass extinctions. They were originally identified as outliers to a general trend of decreasing extinction rates during the Phanerozoic,  but as more stringent statistical tests have been applied to the accumulating data, it has been established that multicellular animal life has experienced five major and many minor mass extinctions.
Permian—Triassic extinction event End Permian: The evidence regarding plants is less clear, but new taxa became dominant after the extinction. The whole late Permian was a difficult time for at least marine life, even before the “Great Dying”. Triassic—Jurassic extinction event End Triassic: Non-dinosaurian archosaurs continued to dominate aquatic environments, while non-archosaurian diapsids continued to dominate marine environments. The Temnospondyl lineage of large amphibians also survived until the Cretaceous in Australia e.
All non-avian dinosaurs became extinct during that time. Mammals and birds , the latter descended from theropod dinosaurs, emerged as dominant large land animals. Despite the popularization of these five events, there is no definite line separating them from other extinction events; using different methods of calculating an extinction’s impact can lead to other events featuring in the top five.
Older fossils are harder to find as they are usually buried at a considerable depth.
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He was of worldwide importance in no fewer than four areas of our game—playing, writing, coaching, and governing. He won the Moscow Championship in , became a grandmaster in , and was a candidate for the world championship at Zurich in He competed in the USSR championship the most powerful national chess championship that ever existed 16 times, winning the title in , ahead of a constellation of now legendary stars—including Mark Taimanov, Viktor Korchnoi, Tigran Petrosian, Efim Geller and Salo Flohr.
He tied for first in with Boris Spassky and Taimanov.
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The Tiger was prone to certain types of track failures and breakdowns, and was limited in range by its high fuel consumption. It was expensive to maintain, but generally mechanically reliable. Today, only a handful of Tigers survive in museums and exhibitions worldwide.
An extinction event (also known as: mass extinction; extinction-level event (ELE), or biotic crisis) is a sharp decrease in the diversity and abundance of macroscopic life. They occur when the rate of extinction increases with respect to the rate of speciation.
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History The history of speed dating starts with Rabbi Yaacov Deyo. In , the rabbi and a group of his students created speed dating as a way to help Jewish singles meet each other. Pete’s Cafe in Beverly Hills was the location for the first speed dating event in the fall of