Physical Science Coursework Week 1

Part I . For me , the most extraordinary and interesting element would be the element iridium (Ir77 . iridium is literally unusual as it is one of the r arest elements to be found in the land s crust . Within the world s crust , on that point are less than one pound of atomic number 77 for both cardinal pounds of gold , 10 pounds of platinum and 80 pounds of money or mercury . On the other hand , Iridium is much more abundant in meteors whereas the prevalence of Iridium in the crust is less than 0 .001 ppm , the copiousness of Iridium in meteors is at levels up to 0 .5ppm (Greenwood Earnshaw 1997This disparity in the abundance of iridium has made it a particularly main(prenominal) artifact in the history of our planet . The theory that the grand deal experimental extermination at the end of the cretaceous era which doomed the dinosaurs was caused by an asteroid impact was bolstered by the discovery of an iridium abundant argument floor .

This rock layer was deposited 65 billion years ago , comparable to the time of the dinosaur extinction . This unusual iridium rich layer coupled with the abundance of iridium in cosmogenic sources seems to show that a meteor crashed into the Earth 65 mya which caused the extinction of the dinosaurs , and as a stead effect also distributed a layer of iridium across the Earth s surfacePart II . This could be explained by the differences in mass between the bullet and the endure . The am ount of energy compulsory to...If you want ! to get a full essay, order it on our website: OrderCustomPaper.com

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