Physical Science Coursework Week 1

Part I . For me , the most laughable and interesting operator would be the element Iridium (Ir77 . Iridium is literally extraordinary as it is one of the r best elements to be bring in the primer coat s bitterness . Within the humans s crust , there are less than one hammer in of Iridium for every iv pounds of gold , 10 pounds of platinum and 80 pounds of silver or mercury . On the separate hand , Iridium is a good deal more(prenominal) 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 atomic number 77 has made it a particularly important artefact in the history of our planet . The theory that the locoweed defunctness at the end of the Cretaceous era which doomed the dinosaurs was caused by an angular impact was bolstered by the discovery of an iridium rich vibrate grade .

This rock layer was deposited 65 one trillion million million years ago , corresponding to the clock time of the dinosaur extinction . This odd iridium rich layer united with the abundance of iridium in cosmogenic sources seems to indicate that a meteor crashed into the Earth 65 mya which caused the extinction of the dinosaurs , and as a view effect also distributed a layer of iridium crossways the Earth s surfacePart II . This could be explained by the differences in mass between the bullet and the rifle . The amount of energy unden! iable to...If you want to get a honorable essay, order it on our website: OrderCustomPaper.com

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