Why is it easy for archaeologists to find campsites of early explorers of over 200 years ago?

Question

anonymous · Answer

They are aided by satellite imagery from the National Aeronautics and Space Administration and data from the Air Force Research Laboratory. In some cases, the technology can reduce a potential dig site from several square miles to a matter of acres.

Early explorers left many artifacts, including iron, behind that indicate where they made camps. Explorer's journals may also be available to help describe locations.