where does earths oxygen come from?

32 Answers

  • goring
    Lv 6
    4 weeks ago

    The same source of Creation that all atomic structures in the Universe came from as indicated in the Biblical record of Creation

  • 4 weeks ago

    Animal from the sea, but i forget the name.. Oh ya its a Mister Crabs enemy on Spongebob Squarepants movie.

  • Sky
    Lv 7
    4 weeks ago

    While the element Oxygen was forged in the stars that blew up and shed their heavy elements out into the universe in vast planetary nebulas that collapsed back down under gravity to form new stars surrounded with planets such as Earth, breathable gaseous O2 oxygen comes from organisms that photosynthesize such as plants and cyanobacteria.

  • 4 weeks ago

    The majority comes from the oceans, the remainder comes from land based plants.

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  • 4 weeks ago

    70 percent comes from algae in the ocean. Even if we cut down 90% of the trees on earth we will still be able to breath.

  • 4 weeks ago


    Stop cutting down the Rainforests immediately

    Sea plants like Seaweed and Sea Grass produce Oxygen

    Any thing that grows should it be Grain or Weed

    Tulips in Amsterdam

    250 Million years ago the whole of Earth was Forested and the Atmosphere was inundated with a glut of Oxygen

    The Result was Snowball Earth when the Temperature plummeted

    It was only changed when a vast area of what is now the Russian Mainland broke out in a Major Shield Volcano

    This warmed the Atmosphere up again to what it is now and normalised Earth so the Dinosaurs could roam

    They were dying out anyway from Global Warming when the Asteroid struck

    The rest is History

    We need to stop damaging our Earth or we will go the same way as the Dinosaurs

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    • roberto
      Lv 6
      4 weeks agoReport

      them smokysauruses did it ehh? bahstids

  • 4 weeks ago

    Photosynthesis. Ultimately, from the supernova which formed the elements in the solar system.

  • Anonymous
    4 weeks ago

    plants, vegetation, forests manufacture the earth's oxygen from the earth's carbon dioxide through photosynthesis.

  • 4 weeks ago

    The last 600 million years, mostly from vegetation gas exchange and photosynthesis.

    Before that, geological decay and volcanism, further back to Earth early development, gravity acquiring gases from nearby space.

  • Clive
    Lv 7
    4 weeks ago

    The same place as everything else. Gas and dust from long-dead stars that went to make up our solar system.

    Why the Earth still has breathable free oxygen that hasn't all combined to make compounds is because of plants. Oxygen is very reactive and if it isn't all going to disappear into oxygen compounds, something has to keep regenerating it. Plants and plant-like bacteria breathe in carbon dioxide and breathe out oxygen, the opposite to animals, so we need them to keep our oxygen supply going.

    Now as plants are the only things we know that do this, if we ever discover a planet with a significant amount of oxygen in the atmosphere, that's an almost sure sign of plant life so it would be worth having a closer look at.

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