6. How might dams on a river
affect the amount of sand on
a beach?

In addition to storing water, the reservoirs behind each of these 500 barriers also trap sand that used to be carried to the shoreline. Dams now withhold sediment from about 16,000 square miles of the state's coastal watersheds and have reduced the flow of sand by 25%, or about 3.6 million cubic yards each year.

Explanation:

easy

explanation:

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves