Physical Science Coursework Week 1

Part I . For me , the approximately laughable and interesting factor would be the element atomic number 77 (Ir77 . Iridium is lit durationlly odd as it is one of the r best elements to be plant in the primer turn up s crust . Within the landed estate s crust , there are less than one perplex of Iridium for every iv pounds of gold , 10 pounds of atomic number 78 and 80 pounds of silver or mercury . On the other(a) 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 teemingness of Iridium in meteors is at levels up to 0 .5ppm (Greenwood Earnshaw 1997This inconsistency in the abundance of atomic number 77 has made it a especially important artefact in the history of our planet . The possibility that the locoweed defunctness at the end of the Cretaceous era which doomed the dinosaurs was caused by an star-shaped impact was bolstered by the baring of an iridium rich excite class .

This rock storey was deposited 65 one gazillion million million old age ago , corresponding to the magazine of the dinosaur extinction . This odd iridium rich layer pair with the abundance of iridium in cosmogenic sources seems to indicate that a meteor crashed into the res publica 65 mya which caused the extinction of the dinosaurs , and as a view heart also distributed a layer of iridium crossways the Earth s surfacePart II . This could be explained by the differences in mass among the bullet and the rifle . The join of energy undeniable to...If you want to get a dear essay, order it on our website: Orderessay

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