timelineofearth

By valenbiniat
  • 45,000 BCE

    Earth creation

    Earth creation
    -4.5 billion years ago
    Earth was created by the gathering of space dust and fragments. As this gathering occurred, the increasing mass, known as proto-Earth, was squeezed by gravity, resulting in a rise in temperature. This temperature increase, combined with extra heat from radioactive decay, made proto-Earth a hot liquid mass. As proto-Earth cooled down, it "organized" itself based on density, resulting in a layered structure.
  • 35,000 BCE

    Emergence of life

    Emergence of life
    -3.5 billion years ago
    This information comes from rock samples discovered in Western Australia and South Africa. These rocks have organic materials, like carbon and hydrogen, which are essential for life.An important aspect of these organic materials is their isotopic signature, which shows low levels of carbon-13. This indicates that the carbon in these materials was altered by living organisms, as natural processes usually prefer the lighter carbon-12 isotope.
  • 2700 BCE

    Oxygenation of the Atmosphere

    Oxygenation of the Atmosphere
    -2.7 billion years ago
    Cyanobacteria, a kind of bacteria, started producing oxygen (O2) via photosynthesis. This action, known as oxygenation, discharged oxygen into the air. As cyanobacteria kept producing oxygen, it started to build up in the atmosphere.This signified an important change in Earth's history, as oxygen opened the door for the development of more intricate life forms, such as animals and plants..
  • 1800 BCE

    Multicellular Organisms appeared

    Multicellular Organisms appeared
    -1800 million years ago
    Grypania spiralis is important because it is thought to be one of the earliest known multicellular living beings on Earth.As a multicellular being, Grypania spiralis consisted of numerous cells that collaborated.This marked a major advancement from single-celled organisms, which were common until that time. Being multicellular enabled more complexity, variety, and adaptability, opening the door for the many types of life forms we observe today..
  • 1600 BCE

    First chloroplasts

    First chloroplasts
    Origin of chloroplastsSimilar to mitochondria, chloroplasts came from a symbiotic event where a photosynthetic bacterium (probably a cyanobacterium) was absorbed by a host eukaryote. Eventually, the absorbed organism developed into a specialized photosynthetic organelle..