Here are some theories. One says that the earth

has been bombarded with comets that brought our water

later, another one, that water was included in the

matter that formed the earth.

Water in magma also influences its viscosity,

which seems to have a big impact on volcanism

and plate tectonics.

Ice might also have contributed to planet

formation as glue, besides magnetism and

gravitation.

https://www.newscientist.com/article/dn12693-earths-water-brewed-at-home-not-in-space

https://www.newscientist.com/article/mg20827853.800-earth-may-have-had-water-from-day-one

http://news.sciencemag.org/2010/11/earth-oceans-were-homegrown

https://news.osu.edu/news/2014/12/17/study-hints-that-ancient-earth-made-its-own-water%E2%80%94geologically/

http://phys.org/news/2010-12-theory-earth.html

http://phys.org/news/2014-03-water-rich-gem-vast-oceans-beneath.html

http://phys.org/news/2010-12-amounts-oceans-earth-terrestrial-planets.html

http://www.nature.com/nature/journal/v507/n7491/full/nature13080.html

http://news.sciencemag.org/chemistry/2014/03/scienceshot-diamond-suggests-presence-water-deep-within-earth

https://www.newscientist.com/article/dn25723-massive-ocean-discovered-towards-earths-core

http://phys.org/news/2014-06-evidence-oceans-deep-earth.html

https://www.newscientist.com/article/dn21066-comets-may-be-creating-oceans-on-alien-planet/

http://news.mit.edu/2011/allende-analysis-0408

http://arxiv.org/abs/1302.1233

http://www.eurekalert.org/pub_releases/2009-11/su-eeo111009.php

http://www.nature.com/nature/journal/v511/n7511/full/nature13539.html

http://arstechnica.com/science/2015/05/asteroid-impacts-3-3-billion-years-ago-may-have-boiled-the-oceans/

http://phys.org/news/2013-03-hidden-magma-layer-scientists-lubricant.html

http://phys.org/news/2015-02-magma.html

https://www.researchgate.net/publication/228673380_Sticky_Ice_Grains_Aid_Planet_Formation_Unusual_Properties_of_Cryogenic_Water_Ice

http://www.abc.net.au/science/news/stories/s1328218.htm

http://scienceblogs.de/astrodicticum-simplex/2010/05/01/das-wasser-der-erde-und-das-eis-der-asteroiden/

http://www.uni-protokolle.de/nachrichten/id/130899/

http://www.welt.de/wissenschaft/article116038710/Mond-und-Erde-haben-das-gleiche-Wasser.html

http://www.deutschlandfunk.de/gemeinsame-quelle.676.de.html?dram:article_id=246185

http://www.deutschlandfunk.de/matsch-im-all.676.de.html?dram:article_id=28038

http://www.welt.de/wissenschaft/article129050079/Wasser-im-Erdmantel-laesst-Gestein-schmelzen.html

http://www.wissenschaft.de/home/-/journal_content/56/12054/914254/

http://www.scienceticker.info/news/EEEpFylkZkZhsVvwDD.shtml

Regards,

Joachim

Article Sticky Ice Grains Aid Planet Formation: Unusual Properties o...

Thanks a lot - some of those i knew, some i didn't - but there are those who maybe add to my theory.... I'm very thankful for this input!

 Nicolai,

This is not a terribly new idea.

http://link.springer.com/article/10.1007%2Fs10509-010-0535-3

It has never been clear that late-stage bombardment by discrete cosmic bodies is required to provide a significant fraction of the total water inventory of earth. There are plenty of arguments for alternative paths.

You will also have to address the D/H anomaly - although the role of fractionation by terrestrial life is complex - as it's not just a matter of delivering water, the nature of the water is also crucial in understanding the origin of the Earth's oceans.

>(lacking the skill set in mathematics and detailed education).

That is a rather large obstacle, but is remedied with time and study. One cannot take short-cuts in this matter.

Thank you very much for this crucial input - so there is much of my thoughts in this, to be sure (minus the link to theia). Very interesting. I initially just was irritated by the lack of alternate information i could obtain through established channels. The wish of not taking short-cuts by the way can be seen as the cause of this post, so none intended. :-) But I deeply appreciate you taking your time, still. Thanks. We will see, how this further develops. :-)

Dear Nicolai,

I can advise you the paper by Elena A. Kadyshevich and Victor E. Ostrovskii, Adv. Plasma Astrophys., IAU 274 Proc., 2011, 95-102 and the subsequent papers about the PFO-CF0 Theory. All they are available at our ResearchGate pages. 

Dear Victor!

Thank you very much for your kind help - I will look into them right after christmas. :-)

Many greets from Munich.