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Lecture 6

EESA06 Lecture 6 Notes

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Environmental Science
Nick Eyles

Lecture 6 During the hydeian period: first time period of earth it was known as the period of hell Rocks were molten, no life could exist, no ocean or atmosphere Things changed, planet differentiated: heavy elements such as iron and magnesium were able to sink, at first it was homogenous and then sank to the center of the earth resulting in the core Once that happened when we have the core, mantle and the crust, we were able to get to the conditions for life to being on planet earth Once planet has been differentiated, there were a magnetic field, holding all the gases escaping from the hot magma of the mantle resulting in building an atmosphere and oceans There are four major steps Fossils How they are formed: a cavity is filled in with minerals such as calcium carbonate and silica or iron. Taking what was an empty space and taking water and circulating water and pulls minerals and precipitate in the shell SLIDE1: Picture of stumps: Petrified forest in Arizona; fossilized stumps, minerals have came in and precipitated Process is called permineralization: sedimentation is when sediments pile up on the creature. Colour of the fossil doesnt have anything to deal with the colour of the creature, it is the chemical of the rock As more sediments pile up, there are more pressure and lithication: turning something into a rock. The bottom rocks get crushed and eventually become lithified and become a sedimentary rock In mineral rich water some of the mineral are able to precipitate out of the water and fills in the cavities of the creatures. Plate tectonics give uplift or two continental crust thickens that build himylias crumples rocks and pushes them to a higher level Can be due to erosion that ware away the rocks No plate tectonics will result in the whole world being ocean because of no mountains and simply just erosions Ammolite(gemstone) have identical halves Ammonite(fossil)
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