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Githyanki
2014-Mar-13, 05:09 AM
How much of Earth's water is subsurface?

Not only crustal but at the mantle where the plates are recycled back into the Earth.

Secondly can Mars and Venus have large amounts of sub-surface water deep trapped?

Glom
2014-Mar-13, 05:15 AM
Water saturates much of the porosity of the crust.

Noclevername
2014-Mar-13, 10:52 AM
http://en.wikipedia.org/wiki/Hydrosphere


Igor Shiklomanov, the man selected by the United Nations to do its world inventory of water resources, [3] estimated that there are 1386 million cubic kilometres of water on earth.[4] This includes water in liquid and frozen forms in groundwaters, glaciers, oceans, lakes and streams. Saline water account for 97.5% of this amount. Fresh water accounts for only 2.5%. Of this fresh water 68.7% is in the "form of ice and permanent snow cover in the Arctic, the Antarctic, and in the mountainous regions. Next, 29.9% exists as fresh groundwaters. Only 0.26% of the total amount of fresh waters on the Earth are concentrated in lakes, reservoirs and river systems...
[snip]
The total mass of the Earth's hydrosphere is about 1.4 1018 tonnes, which is about 0.023% of the Earth's total mass.
So about a third of the fresh water; or about one percent of total water, give or take.

Noclevername
2014-Mar-13, 10:58 AM
Secondly, Mars might have a little but not a lot, as most subsurface water eventually surfaces. Venus, probably not, at it has been baked out by subsurface heat.

PetTastic
2014-Mar-13, 11:57 AM
There has been a string of articles about the mineral Ringwoodite a form of olivine formed at depth that has the potential to hold huge amounts of water all the way down in a planet's crust.