What is under a (sand) desert?

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I mean, a desert is basically just a huge amount of sand but where does it stop, what is beneath? I googled it and it says there’s groundwater but what does that mean, and (how) is that even possible?

Edit: So, actually the main question I wanted to know is if there’s a exact border between sand and rock, or if the sand just gets denser and denser until it’s rock (but I believe the weight must not be that big), like Saturn or something.

(Yes, I know what a desert is but I specifically need to know about this certain type of desert)

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Anonymous 0 Comments

I can’t speak to what specifically lies beneath deserts, but I think you would find it interesting to know that there is no distinct point where sand (soil in general) becomes rock. So theoretically, if it does just continually get more and more compact as you go down, then it is a case like Saturn where there’s no real line where it becomes something else.

Given that earth is more complicated than that though, I’d hazard a guess that there are more distinct layers

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