Fictional Geology

The project I’m currently working on is set on a pair of planets, arranged like Pluto and Charon. Typically (I’m certainly not original, that’s for sure) one planet is very wet (like, super wet) and one planet is very dry (like, super dry). The plot follows the establishment of a small colony on the dry planet. It’s full of xenophobia, mystery and sabotage. There is a struggle to collect and store water from underground and because I’m a sucker for geology, I want to make sure that the dry planet makes sense; that it could actually be possible (at least vaguely!) to have a planet where 95% of the water is trapped underground.

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