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How old is the oldest water on earth?
Answer 1:

Water is involved in a cycle called the “hydrologic cycle”, so it is not possible to put a figure on the age of water. However, water has been on the planet for at least 4.4 billion years in the oceans.


Answer 2:

It looks like in early 2013, scientists discovered a pocket of underground water that is around 2.6 billion years old!


Answer 3:

It depends on what we mean by "old". Fluid inclusions in rocks are known from I believe upwards of three billion years, maybe longer. All of the water in our solar system was here already when the solar system formed, though, which was 4.7 billion years ago. Water itself is made of hydrogen and oxygen. Hydrogen was made in the big bang, and oxygen was cooked in giant stars that went supernova. When the supernovae happened that spiked the solar system with oxygen we will probably never know.


Answer 4:

The amazing thing about water is that virtually all the water that is here has been here since the Earth formed. Although scientists can create and destroy small amounts of water in experiments, all the other water has been unchanged. The water is continually recycled through the water cycle of evaporation and precipitation (for example, rain and snow), but the water you drink is billions of years old.



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