Hi, CBG! We always need biologists around here!
Yet according to evolutionary theory, erosion and plate subduction have been going on as long as the oceans have existed, an alleged three billion years.
Possibly true, at
today's erosion rates. That would be "erosion rates with mechanized agriculture and forestry stripping huge swaths of land nearly bare-nekkid." I don't have numbers at hand, but I would be very unsurprised if current erosion rates are many times the rates of just 200 years ago.