system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are fossils and ruins always found underground? Does land just grow up overtime?
gpt
Wind and rivers will constantly deposit material in lower areas. So yes, he land does grow up over time covering features that once were on the surface. But what about things that are on higher ground? They do get worn down by wind and rain and do get lost to history. So in another way, the fossils and ruins we find are the one that have gotten burried by sediments and dust.