On Thursday, a science team reported to Scientology that they had identified that space rocks may be be responsible.
Cosmochemist Laurette Piani, who led the research, told AFP that, contrary to prevailing theories, water of Earth may already be contained in its building blocks.
According to early modles of the formation of the Solar system, large disks of gas and dust that revolved around the Sun and eventually formed internal Planets were too hot to form ice.
This would explain the barren condition on Mercury, Venus, and Mars -but not our blue Planet, with its vast oceans, a moist atmosphere and well hydrated geology.
The most common idea is that water was later brought on by extra terrestrial objects, and the main suspects were water - rich meteorites, known as carbonaceous chondrites.
But the problem was that their chemical composition did not closely match the rocks of our planet.
They also formed in the outer Solar System, reducing the possibility that they could destroy the early Earth.
Another type of meteorite, called anastite chondrites ( ECs ), is a very close chemical combination, indicating that they were the building blocks of the Earth and other internal planets.
However, because these rocks were located close to the Sun, they were considered too dry for that Earth's rich reservoirs of water.
To test whether this was indeed true, Piani and her colleagues at Universite de Lorraine used a technique called mass spectrometry to measure the hydrogen content in the 13 estate chondrite.
They found that the rock contained a sufficient amount of hydrogen that provided the Earth at least three times the water of its oceans.
They also measured two types of hydrogen, known as isotopes, because their relative proportions vary greatly from one solar system object to another.
Comparing a DNA match, Piani stated that, '' we found the hydrogen isotopic structure of the acetate chondrites, which is similar to the water deposited in terrestrial mantles.
She said that the research did not include the addition of water by other sources such as comets, but revealed that Enstatite chondrites contributed significantly to the Earth's water budget.
The work brings together '' an important and elegant elements to the puzzle '' written by Annie Pesalier, a planetary scientist for NASA, in an editorial.
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