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Water is an essential part of our planet. Without water, no life would be possible. We all learn about the water formula and its cycle in nature. We have also seen how much water there is in the oceans on maps, but... do we know how water appear on our planet?
One of the most known theories says that water arrive in our planet because asteroids and comets have water in them in the form of ice. In the Pre-Cambrian era, thousands of meteorites hit the surface of Earth, causing great destruction. The water stayed on our surface and help create life.
Another theory claims that water existed on Earth from the beginning. Scientists have discovered some asteroids as old as our planet and found evidence of water in them. According to some experts, water could have appeared before we even appeared (on earth).
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