Explain how the rivers are useful to people in those countries with the highest population density

Rivers provide water, and a transportation route (before roads and railroads). They can also form a natural boundary or barrier to protect or defend people. Rivers can provide fish and can also make the lands around them very fertile. if they overflow their banks occasionally.

Explanation:

answer; ///i believe the answer is ( a hitch and signals);

the correct answer would be true friction causes the faults to slip or collide