Most rivers have relatively gentle gradients in the headwaters and steep gradients in their downstream portions.
true / false.

False

Explanation:

Most rivers don't have gentle gradients in the upper course or headwaters, rather most rivers always have steep gradient in their upper course. The upper course of a river is known as the headwaters region. But in their downstream regions, most rivers usually have relatively gentle gradients.

answer; i believe the correct answer is ; large pieces of pangaea drifted in different directions over millions of years;

it depends on the situation, but in a definitional sense, irrendentism is more valid.

explanation: