What are the components needed to make a complete circuit? describe them.

Would really appreciate it, i have an idea but not completely sure

Most of the fossils found in virginia are in the coastal plain, valley, ridge, and appalachian plateau regions, best suggesting that these geographic provinces a) were once covered by seawater. b) are the oldest parts of virginia. c) have a great deal of karst topography. d) have large amounts of sedimentary rock.

This is so important ugh its 25 points