4, Irwin and Lewis, History of Earth Timeline

  • (5 BYA) Beginning of solar system

    (5 BYA) Beginning of solar system
    The Sun ignites, and Solar system begins to take shape. This was a direct result of the big bang. It happened because billions of particles bonded together and reacted with eachother. This event paved the way for all life.
  • Formation of Earth (4.6 BYA)

    Formation of Earth (4.6 BYA)
    The congregation of molten particles caused the formation of the Earth. The particles all bonded together due to a mutual attraction to each other. This event effects all known life, because the Earth is the only known planet to house it.
  • Moon forms by collision and the Earth's crust forms (4BYA)

    Moon forms by collision and the Earth's crust forms  (4BYA)
    A large object collides with the Earth, causing a peice of it to break off. This peice is the moon. the inorganic molecules on Earth also form rock under the firey conditions. This formation of rock is Earth's first step to becoming a more hospitible planet.
  • Formation of Prokaryotes (3.5 BYA)

    Formation of Prokaryotes (3.5 BYA)
    The conditions of the Earth at this time allowed for the formation of Prokaryotes (the simplest life form). These organisms lived in the water. This event affects all life forms on Earth, as these organisms marked the beginning of life on Earth.
  • Photosynthesis begins, allowing more cells to proliferate and iteract (3 BYA)

    Photosynthesis begins, allowing more cells to proliferate and iteract (3 BYA)
    Because of the marine photosynthesis that was occurring, there was an influx in the amount of oxygen in the atmosphere, allowing cells to live and grow. This effected all future life on Earth, as the growth of these cells that repirate aerobically are the beginning of the modern life forms that we see on Earth today (not including archea bacteria)
  • Rise in O2 (2.2 BYA)

    Rise in O2 (2.2 BYA)
    The photosynthesis that began .8 billion years before resulted in a buildup of O2 (a by product of photosynthesis) in the atmosphere, because the by product of photosynthesis (O2) was released into the air. This affected all aerobic life forms, because it gave them more oxygen to breathe.
  • Cells calaborate and specialize (2 BYA)

    Cells calaborate and specialize (2 BYA)
    Now that the cells are able to thrive in the current conditions, they begin to specialize and callobarate. This means that two or more cells formed a symbiotic relationship with eachother, so that each would benefit from the others presence. This led to the formation of a nucleus, which was actually a cell that had been engulfed by another cell (common method of pairing up). This effected all organisms that utilize Eukaryotic cells, as this is the earliest appearence of those kinds of cells.
  • Formation of Eukaryotes (1.5 BYA)

    Formation of Eukaryotes (1.5 BYA)
    For the reasons specified in the previous event, cells teamed up for mutual benefit, forming Eukaryotic cells.
  • Ozone layer forms(1 BYA)

    Ozone layer forms(1 BYA)
    A combination of the large amount of O2 in the air and the Sun's UV rays caused the Earth's ozone layer to form. This happened the the formation of O3 molecules. These were created when O2 molecules were slpit of UV light. When the free O molecule bonded to an O2 molecule, ozone was formed. This ozone layer formed a protecive barrier for life forms, offering shelter from harmful UV ray, affecting all life.
  • Influencial scientists (1590- present)

    Influencial scientists (1590- present)
    First Microscopes- 1590
    Radiometric dating-1905
    Urey and Miller-1952
    Lynn Margulis-1966
    All of these accomplishments/scientists heled to increase our undertanding of life and how it came to be.