system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How come the ocean isn’t making the ocean floor compact? Like, the pressure at the ocean floor is absurd, the weight of the ~4km of water is a lot and yet we see the sand loose.
gpt
The pressure exerted on the sand at the bottom is experienced in all direction. They are separated because they have different densities.

Imagine you have a plate on the floor of a pool. Apart from just it's inertia and the viscosity of the water you could easily pick it up.

Large pressure differences on either side of the object are what causes noticeable forces. 

Now imagine the same circumstance except this time there is a drain at the bottom leading to open air and the plate is covering it. The force from the weight of the water is much greater than the force from the weight of the air so it's pressed into the floor and difficult to move.