Which of the following is not a characteristic of rivers and streams?

a. vary in size

b. mainly saltwater

c. part of the water cycle

d. flow toward other bodies of water

The correct answer is B. mainly salt water. They are mostly not salt water because rivers and streams are fresh water. Oceans and seas are salt water and freshwater rivers enter seas and oceans and decrease salinity. Fish like trouts could not live in the rivers if it was sea water and they usually have a completely different body consistency than the sea water fish do.