How did cataracts in the Nile River make transportation difficult? Cataracts caused parts of the riverbed to dry out.
Cataracts contained rocks and boulders that made the river impassable.
Cataracts changed the directional flow of the water.
Cataracts’ shallow depth and rushing water made the river impassable.

10 points per question and brainlist 1. name four of the ruling dynasties of china. describe at least three contributions to society from each dynasty. 2. why did the qin ruler zheng burn chinese literature and philosophy books? how did the han dynasty establish a strong and effective government? why did people rebel against the sui rule? 3. what new technologies were invented during the tang dynasty and fully developed in the song dynasty that would eventually have a great impact on the world? explain why this technology had such an impact. 4. who were the invaders that seized control and took over the song dynasty? 5. how was china's history affected by its policies of isolation from the outside world during the ming dynasty?