The importance of Fall line is that it act as the boundary at the streams for boat traffics.
A fall line refers to the area where a highland region meets a coastal plain, and it is usually visible where rivers cross it, resulting in rapids or waterfalls.
The uplands are composed of relatively hard crystalline foundation rock, whilst the coastal plain is composed of softer sedimentary rock. It protects the boat trafficking by acting as the natural border.
Therefore, it can be concluded that The significance of the Fall line is that it serves as a limit at the streams for boat traffic.
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