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

After 3 to 5 layers of sand, you will start seeing sandstone blocks, and under that would be dirt or cobblestone.

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