How hot does water have to be at the bottom of the Marianas Trench to become steam?
I’d suggest it IS liquid.
Well, maybe I’m reading it wrong. But the whole concept here seems to be that as the crust subducts and plunges down, it carries with it liquid water itself as well as large amounts of water trapped in crystalline lattices (limestone/concrete type materials).
So I didn’t think they were talking about gaseous water.
That’s all.
Yep. I caught my error and corrected it in a later post.
But now that you mention it,
~10 km water -> ~1000 atm -> 945°C boiling point.
That’s for pure water, adding salts and minerals increases the boiling point.
The pressure under a mile or so of rock would be MUCH higher...