Describe three conditions necessary for coastal deposition?

1. A source of sediment: Coastal deposition requires a source of sediment, such as eroded material from nearby cliffs, rivers, or offshore sources. This sediment can be transported by waves, currents, or wind and deposited along the coast.

2. Energy to transport sediment: Coastal deposition also requires energy to transport sediment from its source to the deposition site. This energy can come from waves, tides, or currents that move the sediment along the coast and eventually deposit it in a specific location.

3. Sheltered environment: Coastal deposition is more likely to occur in sheltered environments where the energy of waves and currents is reduced. Sheltered bays, estuaries, and lagoons provide a calm and stable environment for sediment to settle and accumulate over time. These sheltered areas protect the sediment from being washed away by strong waves or currents, allowing for the formation of depositional features such as beaches, sandbars, and deltas.

1. Sediment Supply: An ample supply of sediment from sources such as rivers, glaciers, or eroding cliffs is required for coastal deposition to occur.
2. Calm Waters: Wave energy and currents must be relatively low to allow sediment to settle and accumulate on the coast. Sheltered bays, estuaries, and lagoons provide favorable conditions for deposition.
3. Subsidence or Sea-Level Rise: The coastline must either be subsiding (sinking) or sea level must be rising to create space for sediment to be deposited. Subsidence can occur due to tectonic activity or compaction of underlying sediments, while sea-level rise can result from global warming or melting glaciers.