Waves usually reach the shore at an (a), this is because of the (b) direction, because of this sand is moved up the beach by the (c) of the wave at an angle. The (d) carries the material directly back down the beach due to gravity. This process is repeated producing a (e) pattern which moves sand along the shore by a steady current. People have built wooden groynes to stop this movement and widen the beach. Unfortunately this can starve beaches further along the coast of fresh sand leading to increased e(f). .Where the coast changes direction suddenly the sand is deposited out to sea producing a (g) such as Spurn Head.