Why are sand dunes commonly found along the coast?(1 point) The salt in the water is needed to hold the sand together. The salt in the water is needed to hold the sand together. Moving water is needed to deposit the particles on the river bed. Moving water is needed to deposit the particles on the river bed. There is a lot of wind to carry the particles. There is a lot of wind to carry the particles. Heavy wave action is needed to move the sand.