Question

Which of the following best describes the difference between a coastline and a sand dune?

Only dunes are made of sand.

A coastline is a mound of sand, while a dune is the area bordering the water.

Only coastlines help to protect inland communities from ocean waves.

A dune is a mound of sand, while a coastline is the area bordering the water.

Answer 1

"A dune is a mound of sand, while a coastline is the area bordering the water." — This correctly distinguishes a dune (a wind-formed sand hill) from a coastline (the boundary between land and sea).