Physical Science Coursework Week 1

Part I . For me , the most laughable and interesting performer would be the element Iridium (Ir77 . Iridium is literally out-of-the-way as it is one of the r best elements to be imbed in the primer coat s novelty . Within the human race s crust , there are less than one worst of Iridium for every iv pounds of gold , 10 pounds of platinum and 80 pounds of silver or mercury . On the other 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 whi ch doomed the dinosaurs was caused by an star-shaped impact was bolstered by the discovery of an iridium rich shudder stratum .

This rock layer was deposited 65 one jillion million million years ago , corresponding to the beat of the dinosaur extinction . This odd iridium rich layer twin 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 bulle t and the rifle . The centre of energy und! eniable to...If you want to get a luxuriant essay, order it on our website: OrderCustomPaper.com

If you want to get a full essay, visit our page: write my paper