Coastal erosion produces beautiful beaches and some rather unusual land formations, from spits to stacks, mud flats to salt marshes.
- Cliffs are formed when destructive waves attack the bottom of rock faces.
- Weak points in the rock give way to a hollow called a wave-cut notch.
- The cliff retreats and eventually the overhanging rock collapses, forming a wave-cut platform.
- Beaches are built up as sand, pebbles, and rocks are deposited by constructive waves.
The continual battle between land and sea is apparent here - along the northwest coast of America - where erosion is the predominant force.
Millions of years ago, this coastline would have looked very different.
Even though the land is tough basalt, the relentless attack of the sea has eroded it in ...
Please log in to view and download the complete transcript.