Geo 101 Ch. 11
Geo 101 Ch. 11 GEO 101
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This 3 page Class Notes was uploaded by Shannon zarrilli on Monday January 25, 2016. The Class Notes belongs to GEO 101 at University of Alabama - Tuscaloosa taught by Dr. Natasha T. Dimova in Fall 2016. Since its upload, it has received 49 views. For similar materials see The Dynamic Earth in Geology at University of Alabama - Tuscaloosa.
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Date Created: 01/25/16
Geo 101 Ch 11 Geologic time the span of the time since earth s formation From geo records analyzes of rocks from the earth and the moon it was estimated that the earth is 46 billion years old The geologic time scale is organized in columns and rows the Precambrian period is divided into Eons and each eon is divided in eras eras split into period and the last period most recent is divided in epochs speci cally pay attention on the three most recent eras Paleozoic Mezozoic and Cenozoic Geocentric theory the Earth is in the center of the Universe Heliocentric theory the Sun is the center of the Universe Star system a group of one or more stars with planets orbiting around them Example Solar system the Sun located in the center Galaxy a massive group of millions of star systems Example of galaxy is our Milkey Way Andromeda Universe includes billions of galaxies quotin the beginningquot The Big Bang 1 Occurred about 14 billion years ago Ga 2 All matterenergy the Universe was packed into one point violently exploded 3 Led to creation of elements Evidence 1 Galaxies appear to be moving away from each other at speeds proportional to their distance quotHubble39s Lawquot ie observation supports the expansion of the universe and suggests that the universe was once compacted 2 We are still quotcooling downquot 3 The availability of quotlight elementsquot Hydrogen H and Helium He found in the observable universethis is the original material for planet formation Nebular Hypothesis Nebular Disk Model 1 stars form from massive and dense clouds nebulae of hydrogen H2 gas 2 slowly rotates gradually collapses and attens in a form of a disk due to gravity 3 Planets form on this disk The Hadean Eon the birth of the earth 1 Matter accumulates and compacts into dense ball 2 Temperature increased due to compaction and radioactive decaynuclear reactions 3 The balllike planet partially melted and different layers developed due to different densities of the forming material 4 Collision with other planet resulted in developing the Earth s satellitethe Moon 5 Atmosphere develops due to major outgassing of formation gases CH4 C02 H20 originally incorporated in the planet formation 6 The Earth started cooling down Hard rocks solidi ed Water condensed and started rainfalls Ocean formed and basic hydrological cycle was initiated The Archean Eon the birth of continents and rst life 1 Intensive volcanic activity led to island formation which collided into larger land rst small continents appeared 2 First primitive life appeared in the warm oceans Life probably was sustained in the deep ocean via chemosynthesis 3 By the end First continent formed with evidence for mountain building Life took place on shallow coastal areas rst photosynthesizing organisms Oxygen 02 started accumulating the atmosphere The Proterozoic eon 1 New continental crust continued to form but slowersmall plates collided in larger continents crotons 2 Most of the land was brought together into single supercontinent Rodinia
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