Why Do Beaches Become Sediment-Starved After Dams Are Installed on Rivers

question 17

Multiple Choice

Why do beaches become sediment-starved after dams are installed on rivers?

• A)Dams trap water,thus reducing the volume of water that enters the ocean and erodes away the coast to produce sediment.
• B)Rivers supply sediment to beaches;dams trap river sediment,and thus that sediment cannot make it to the beaches.
• C)The chemical composition of river water is changed when it flows through a dam;this alters the amount of chemical weathering that occurs along the coast.
• D)Dams are built using sediment covered in concrete;the sediment most often comes from nearby beaches.

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