Physical Science Coursework Week 1

Part I . For me , the some laughable and interesting divisor would be the element atomic number 77 (Ir77 . atomic number 77 is literally uncommon as it is single of the r arest elements to be found in the land s crust . inwardly the world s crust , at that place are little than one pound of atomic number 77 for all cardinal pounds of gold , 10 pounds of platinum and 80 pounds of flatware or mercury . On the other hand , atomic number 77 is much more easy 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 make it a particularly in-chief(postnominal) artifact in the record of our planet . The theory that the dandy 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 rank shiver seam .

This rock layer was deposited 65 gazillion years ago , equal to the time of the dinosaur defunctness . This unusual iridium rich layer coupled with the abundance of iridium in cosmogenic sources seems to orient that a meteor crashed into the background 65 mya which caused the extinction of the dinosaurs , and as a location effect also distributed a layer of iridium crossways the Earth s surfacePart II . This could be explained by the differences in tummy between the bullet and the strip down . The amount of energy tyrannical to...If you want to get a full essay, order it on our website: Ordercustompaper.com

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