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lastminuteplanetearthnotes.docx

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Department
Chemistry
Course
CHM299Y5
Professor
murk
Semester
Winter

Description
UNIVERSE  universe started with big bang  hydrogen atoms form as well as heliums  atoms collected into nebulae which then collapsed into dense balls which made stars  15ga old Galaxy formation  The protoplanetary disk has 92 elements  dusty gassy and icy rings began to clump together due to gravity  formed planetesimals, then collisions kept adding cuz the planetesials acted like a vaccum, eventually called a protoplanet Earth  huge asteroid collided casusing shit to break off and become the moon  heat frm collisions and radioactive elements caused differentiation causing the iron to sink to bottom of earth. denser shit sinks  earth is round cause gravity changed its shape. this is cuz as earth was getting bigger its interior becomes warm and protrusions are pulled inward making a sphere cuz mass evenly distributed  atmosphere develops frm volcanic gases. wen earth became cool moisture condenses and rains to make oceans  4.56ga Ages  Hadean era -4.6ga-4.1ga  archean era 4.1 -2.6ga –  proterzoic 2.5ga to 542ma  phanerazoic 542ma to now  Paleozoic-mesozoic-cenozoic The Wilson cycle describes ocean basins, and the stages that they go through from creation to elimination. There are six seperate stages of the Wilson cycle: Embryonic: Thick continental crust blocks the flow of heat, and there is a change in convection currents of the asthenosphere (the soft plastic layer on which the continental and ocean plates 'float'). There is an upwelling of magma, which causes continental rifting to begin. The East African rift valley system is an example of this process.
 Youth: The rift expands as magma continues to rise to the Our new ocean grows wider begins to age. The passive boundaries between the continent and the oceans are accumulating sedimentescence: from the erosion of the continents. The Atlantic Ocean is one such maturing ocean basin.
 Maturity: The weight of accumulating sediments at the margin where continental crust meets the ocean basin causes depression of the ocean crust. Eventually, a subduction zone is formed, where the thinner, dense ocean crust slips below the continental crust. See Pacific Ocean as an example of this stage in ocean development. 
 Old Age: Accretionary wedges are formed as sediments are scraped off the subducting ocean crust which is exempl
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