Concept:Coastal erosion is primarily determined by the energy and type of waves that strike the shoreline.
Explanation:Destructive waves have high energy and a strong backwash, which scoops out and removes beach material.
This backwash is more powerful than the swash, so sediment is carried away from the coast.
Constructive waves are gentler and have a stronger swash, which deposits sand and builds up the shore.
Thus, when destructive waves dominate, erosion is greater; when constructive waves dominate, erosion is reduced.
Fresh water supply, depth of ocean water, and salinity do not directly control how much coast is eroded.
These factors may influence marine life or water properties, but wave nature is the main driving force of erosion.
Therefore, the extent of coastal erosion depends directly on the nature of the waves.
Answer:D. nature of the waves