A fall line is a geologic break between an upland region and a coastal plain, and is often crossed by a river with varying degrees of rapids. Therefore, the option A holds true.
What is the significance of a geologic break?
A geologic break can be referred to or considered as a period in which the surface of the earth starts to behave differently, and there are occurrences of unusual events in order to maintain a uniformity ahead.
A fall line is also a form of such geologic break. This is because a geologic break is always bound to happen by crossing the breadths of a river. A fall line causes, bringing a variation of degrees quickly while it takes place.
Therefore, the option A holds true and states regarding the significance of a geologic break.
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