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Period 5,Smith and Karpinski, History of Earth Timeline

  • 5 BYA, Creation of Solar System

    5 BYA, Creation of Solar System
    Solar System was created about 5 billion years ago. Solar system formed because of the collapse of a molecular cloud due to gravity. Other planets started to form shortly after
  • 4.6 BYA Earth Forms

    4.6 BYA Earth Forms
    Planet Earth started to form around 4.6 billion years ago by colliding with space debris. Earth is the only planet with visible surface water and has the essential items to contain life
  • 4 BYA Atmosphere Forms

    4 BYA Atmosphere Forms
    Volcanoes emit gas and the Atmosphere is formed. More Oxygen is emitted into the atmosphere and life is almost possible to live on earth. The bombardment of asteroids help to make life possible on earth
  • 3.5 BYA Life emerges

    3.5 BYA Life emerges
    Signs of life emerge as gases and oxygen are emitted into the air to allowe some forms of life like archaea. Fossils have been found that also date back to this time
  • 3 BYA Photosynthetic Life

    3 BYA Photosynthetic Life
    Photosynthetic life emerges around 3 BYA. This include froms of plant and bacteria that rely on themselves to eat and continue to live
  • 2.2 BYA Present-day Earth

    2.2 BYA Present-day Earth
    The earth appears and looks very similar to it does today. Large amounts of oxygen enter the atmosphere and the first modern human species emerge
  • 2 BYA Oxygen

    2 BYA Oxygen
    Oxygen levels reach the levels that they currently are today. This allows multiple form of life to survive in the environment
  • 1.5 BYA Endosymbiosis

    1.5 BYA Endosymbiosis
    Small Aerobic Prokaryotes begin to live inside other prokaryotes. This process is called Endosymbiosis
  • 1 BYA Ozone

    1 BYA Ozone
    The ozone layer is formed and now protects organisms form harmful UV or ultraviolet rays. This allows our current human species to exist on land today
  • 1600-present

    First Microscopes are Developed (Early 1600's)
    Redi's Experiment(1660's) - Maggots and Flies Experiment
    Spallanzani's Experiment(1750's) - Spontanious Generation
    Pasteurs Experiment(Early 1800's) - curved neck flask experiment
    Oparin's Hyothesis - The study of the atmosphere (1920's)
    Fox(early 1940's) - Research on 1st cells
    Thomas Cech - RNA as a new catalyst(1947)
    Urey and Miller - Follow up on Oparins Hypothesis(late 1940's)
    Lynn Margulis - Study of Prokaryote cells and 1st bacteral beginnin