How is sand transported in coastal environments by the action of waves? Question 3 options: a) Waves will only move sand up and down the beach along the steepest slope of the coastline. b) Waves move sand diagonally up (in the direction of the wave) and then down the steepest slope of the beach, having a net transport parallel to the shoreline. c) By the wind that is associated with the wave. d) By underground rivers.Why is sand typically transported parallel to the shore by wave action? Question 4 options: a) Sand particles are repelled by the open sea. b) Wave action and the steepness of the slope combine to create a net transport parallel to the shoreline. c) Sand is afraid of moving perpendicular to the shore. d) Coastal winds push sand in a parallel direction to the waves