One Ugly Christian
New member
Welcome back OUC! It is nice to here thoughtful opinions on this thread.
The magma that erupts from volcanoes producing steam has come from the upper mantle when that rock absorbs water from the ocean trench, which subducts sea water along with the oceanic plate rock and sediment. The water lowers the melting point so you get wet, molten rock melting its way up to the surface.
You're right that the presence of deep water was not a popular idea 50 yrs ago, but I remember being told 25 years ago when I studied Geology that it was expected to be found.
Thank you for this.
I didn't make my point very clear on volcanic eruptions. Scientists are saying that much of the water produced in these eruptions are from much too deep to have come from subduction. It was that fact along with the finding of materials they believed came from very deep in the earth's surface which were found to contain water which prompted the theories that there was water trapped in rocks as much as hundreds of kilometers down. These theories and the finding of oceans of water possibly as deep as 600 miles do not seem to comport with an earth that was completely molten not once but twice as molten rock squeeze almost all water out.