Why do we have coasts?

Coasts are formed through the interaction of land and water, primarily due to the processes of erosion, sediment deposition, and tectonic activity. Waves, currents, and tides shape the coastline by eroding rock and soil, while rivers and glaciers transport sediments that build up coastal features like beaches and deltas. Additionally, geological processes, such as the uplift of land or changes in sea level, contribute to the dynamic nature of coasts. Overall, coasts are essential ecosystems that support diverse wildlife and human activities, making them vital to both natural and economic systems.