Fiery earth of death

Period #2, Lookenbill, Palic, History of Earth Timeline

  • (5 B.Y.A.) Solar System Formation

    (5 B.Y.A.) Solar System Formation
    The sun and other planets began forming by gravity and collisions of space debris.
  • (4.6 B.Y.A.) Formation of the Earth

    (4.6 B.Y.A.) Formation of the Earth
    The earth formed by gravity pulling debris together.
  • (4 B.Y.A.) Cooling of the Earth

    (4 B.Y.A.) Cooling of the Earth
    The earth's surface began cooling and organic molecules began accumulating.
  • (4 B.Y.A) Archaea-like Life

    (4 B.Y.A) Archaea-like Life
    Archaea-like life existed on earth.
  • (3.5 B.Y.A.) Stromatolites

    (3.5 B.Y.A.) Stromatolites
    Stromatolites are cyanobacteria that form large colonies and grow in layers.
  • (3 B.Y.A.) Photosynthesis

    (3 B.Y.A.) Photosynthesis
    Some forms of life had become photosynthetic.
  • (2.2 B.Y.A.) Earth

    (2.2 B.Y.A.) Earth
    The earth cooled and looks very similar to today.
  • (2 B.Y.A.) Oxygen

    (2 B.Y.A.) Oxygen
    Oxygen in the atmosphere reached today's levels.
  • (1.5 B.Y.A) Endosymbiosis

    (1.5 B.Y.A) Endosymbiosis
    Prokaryote began to live and reproduce.
  • (1 B.Y.A.) Ozone

    (1 B.Y.A.) Ozone
    Ozone formed to protect organisms from harmful UV rays so they could exsist on land.
  • (ca. 1625) First Microscope

    (ca. 1625) First Microscope
    It allowed scientists to closer examine living things. It led to the discovery of cells.
  • (1668) Redi's Experiment

    (1668) Redi's Experiment
    Redi placed rotting meat in a jar with and without a cover. Maggots formed in the jar without the lid and none with the lid. This proved that flies do not spontaneoulsy generate.
  • (1768) Spallanzani''s Experiment

    (1768) Spallanzani''s Experiment
    He boiled broth and sealed some of the flasks. The unsealed flask grew microorganisms. The sealed one did not grow microorganisms. This proved that microorganisms do not spontaneously generate.
  • (1859) Pasteur's Experiment

    (1859) Pasteur's Experiment
    He did the same experiment as Spallanzani, but used a curved necked flask showing that vital force could still be present, but not spotaneous generation.
  • (1907) Radiometric Dating

    (1907) Radiometric Dating
    Radiometric dating used half-lives of elements to determine how long a sample of something has meen decaying. It allows us to determine the earth's age.
  • (1924) Oparin's Hypothesis

    (1924) Oparin's Hypothesis
    He thought early atmosphere contained ammonia. hydrogen gas. water vapor, and compounds of hydrogen and carbon. They recombined to be organic compounds.
  • (1953) Urey and MIller

    (1953) Urey and MIller
    They tested Oparin's hypothesis with gases and electic sparks. He proved Oparin's hypothesis was correct.
  • (1957) Sidney Fox

    (1957) Sidney Fox
    He did research on organisms that may have given rise to the first cells, such as coacervates and microspohere. It helped exlain where the first cells came from.
  • (1967) Lynn Margulis

    (1967) Lynn Margulis
    She proposted a theory of endosymbiosis; a small prokaryote is inside a larger one. The prokaryotes led to mitochondria. This helped discover why eukaryotic cells formed.
  • (1982) Thomas Cech

    (1982) Thomas Cech
    He found type of RNA in some unicellular eukaryotes that could act as a catalyst. He led other scientists to discover that this RNA could self-replicate.