NASA - Water's Family Tree: Where Did It Come From?

NASA - Water's Family Tree: Where Did It Come From?

If we want to learn something about our ancestry, we can consult a number of sources for clues: the stories of family members; public records, such as birth certificates and census reports; and DNA sequencing. Scientists who study Earth’s water also rely on a number of sources to try to explain where water came from. However, since no storyteller existed when Earth was forming into our blue planet, they must rely on the geologic record, and chemistry. (See full story for image gallery.)

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