We’ve seen it many, many times: the ship gets into a firefight, takes a few hits, shakes around, and consoles explode (possibly taking an unfortunate ensign with them). Eventually the battle is resolved with our heroes largely intact if somewhat shaken up. If it was a particularly nasty battle, there will be signs of damage: scorches on the walls, deformed equipment, busted lights, and rocks scattered about.
All of that seems reasonable… except the rocks, which look pretty out of place in a spiffy 24th century starship. So why are they there?
What, you don’t think they’d replicate a starship to be made out of concrete?
I joke, but I think that’s the idea. Real-world disaster zones will have bits of concrete rubble, and the visual effects people were probably copying that. I do suppose we never see a ship being replicated, so maybe they’re made the old-fashioned way and asteroid-based concrete is actually used for cost (however that’s evaluated in-universe) reasons.