[MEGoody]

"You CAN observe and reasonably calculate erosion on hard stone over time."

Yes, you can observe for a time, maybe even years, but not thousands of years. Yes, you can calculate, presuming that all variables and their effects are known.

"That is some glaring quote mining you've got going on."

Whatever that is supposed to mean.

[Shryke]

Yes, you can calculate, presuming that all variables and their effects are known.

AH! We agree. You realize that those calculations would preclude 4000 years, yes?