Pieces of rock and sand settle to the bottom or sides of a river because: they are heavier than waterthey are lighter than watergravity is stronger in a river than on landwind blows the pieces to the bottom

Which of the following characteristics define a state? check all that apply. a. a population of people b. a sovereign government that determines how a group of people is ruled c. an army, military, or police force d. a territory with set borders