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composed of sand, coastal erosion creates little problem for the beach because it uses this sand to Chapter 9 Beach Erosion and Loss 3 sustain the environment. After all, sand is the lifeblood of beaches. However, migrating upward and landward through space and time does create a huge problem for buildings and roads built too close to the shoreline. And therein lies the rub â protecting the land with a seawall will lead to beach loss.
Section 1. Shoreline Erosion and Deposition. Key Concept Beaches and shorelines are shaped largely by the action of ocean. waves. What You Will Learn. â¢ Energy from waves crashing against rocks affects shorelines. â¢ Shoreline features are created by wave erosion. â¢ Waves deposit sediment at the shore to form beaches. Why It Matters. Waves erode and deposit materials along beaches and shorelines throughout. California and the world. Two ingredients are needed to make sand: rock and energy. Rock is usually. available on the shore.