Question

why are the continental divide and the fall line two important physical features in the United States?

Answer 1

The Continental Divide creates a dividing line within the US where all precipitation - rain, snow, etc. that fall on the western edge eventually will flow to the Pacific Ocean and all precipitation that falls on the eastern side of the ridge flows toward the Mississippi River.

AND

A fall line is the imaginary line between two parallel rivers, at the point where rivers plunge, or fall, at roughly the same elevation. ... This line was important to early European explorers because it marked the limits of river travel for ships.

Step-by-step explanation:

Answer 2

The continental divide is important because it determines which direction rivers flow from their headwaters since it is at this divide point that water either flows one way or another so this explains where the important rivers flow ie say the Mississippi or Missouri. The fall line is where two parallel rivers drop down from a height of land so most likely would prevent navigation of the river at this point.