The movie adaptation novel (iirc) said the wreakage would be removed
Short answer: It's probably still there, growing moss on it and stuff.
Long answer: I'd like to think some random collection of civilian colonists made it their home. Think about it: if you just patched up the holes and damaged areas, replaced the broken windows, and cleaned and tidied up a bit, then bam! Instant planetside starbase or small city. It could be like the Ba'ku village from "Insurrection", where the people essentially were farmers and agriculturally-minded folk, and therefore didn't need much attention from Starfleet in general. Send a supply ship every year or so, and it would be a fine community.
Should have been completely removed,and repaired the damage done to the area by reentry.
Yep, definitely condos. Maybe a shopping mall.
Would they go to the length of recapping that mountain top? That flat top would raise questions as soon as the locals send their first probe.
We have flat top mountains on Earth but we don't attribute them to alien spaceship crashes.
But anyway, it depends how far away they are from build space probes. They were described as 'pre-industrial' but that could mean very pre-industrial, it could be a thousand years before they reach that level of technology. Earth's human population reached 230 million (the figure Data quoted) around the year 700 AD.
So, you'd expect rain, snow, ice and tree roots to soften out the flat top a bit over that time, so there may be no need to intervene. When they do finally notice it, their scientists could easily attribute it to an asteroid or something.
Having said that, a bit of precise phaser work from orbit to soften out the sides wouldn't be much effort for a Starship.
Thanks for link, now I fancy mashed potato
Centuries of weathering would soften the top, certainly, but there would still be evidence incongruous with the geography. Striations in the rock would record the impact for millennia.
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