What is the natural boundary that separates the coastal plain and piedmont regions? a: fall line b: savannah river c: atlantic coastline d: appalachian mountains

I believe it's A. fall line

on this day in 1913, henry ford installs the first moving assembly line for the mass production of an entire automobile. his innovation reduced the time it took to build a car from more than 12 hours to two hours and 30 minutes.