What keeps water from sinking into earth?

Question

I remember reading somewhere that there's evidence of water on Mars but it all sank into the Martian soil. So what prevents that happening on earth? Some people say it's because the crust is not permeable to water, but that must be nonsense because of volcanic actions and earthquakes, there certainly will be cracks that allow water to flow through. So the only thing that prevents the water from sinking in is the temperature, right?

Answer 1

Nope.

Water is less dense than molten stone (magma).

Also, soil is different from bedrock, which is probably the part of the crust that anonymous someone was talking about.

In case you'd like to know more, I suggest looking up aquifiers and how wells function. You'll find that some of earth's water has indeed sunk into the soil (at least in some places), as there isn't much preventing it.