What was the original source of water on the earth?
The original source of water on earth probably began some 4.5 billion of
years ago when the planet was beeing formed. Scientists consider 3 possible
sources for water , namely:
separated from the rocks that made the bulk of earth;
arrived from outer-space, as part of meteorites;
arrived from outer-space, as part of comets.
These still are theories, mostly because outer-space water sometimes
is not exactly the same kind of "our" water ( for example, the hydrogen
is heavy isotope deuterium ) .
Anyway, quite answering your question science@NASA bulletin published
today (05/18) (Science.nasa.gov/headlines/y2001/ast18may_1.html)
tell us about the breaking of comet LINEAR as it passed near the Sun,
releasing water with the same composition as oceans earth water. That
is somehow a heavy argument for the theory of comets beeing carriers of
water to planet earth.
Thanks for asking NEWTON! Tell your friends about it!
(Dr. Mabel Rodrigues)
Click here to return to the Environmental and Earth Science Archives
Update: June 2012