The Fall line which is the north-south running boundary where Virginia
rivers drop down from resistant metamorphic rock layers onto flat,
sedimentary separates what 2 provinces (regions).

Coastal plain and Piedmont

Explanation:

A fall line refers to an imaginary line between two parallel rivers and usually at the point where rivers fall at roughly the same height.

Fall line is the north-south running boundary where Virginia rivers drop down from resistant metamorphic rock layers onto flat sedimentary rocks. It separates the Coastal Plain and the Piedmont.

modern sasaram city covers the largest sub-metropolitan area of bihar. it has many famous religious and historical spots and is surrounded by the scenic kaimur mountain range and rivers like sone and kav. sasaram city is situated in the middle of many industries.

explanation: