Anyone know any unblocked games on a school chromebook school is ringlardner in MI please tell me sum fun 1 s also my question so diss dont get deleted : How did the physical environment of river valleys negatively impact ancient civilizations?

O The land was attractive to people outside invaders who wished to conquer the land.

O Rivers prevented the people from moving because they could not cross them.

O Occasionally extreme flooding caused great damage and killed many people.

O Silt in the rivers made the water dirty and possibly unsafe for people to drink.