Waves crash against the cliffs. The coast is where the land meets the sea or ocean. Some coasts are shaped by the action of waves crashing against them. The rocks are gradually worn away, sometimes creating cliffs, the steep edge between the land and the sea. Bays are carved out where the coastal rocks are softer. In other places, the sea shapes the coast by piling up sand and shingle to make new land.
Hard rocks erode slowly. They stand out as headlands. Waves wear away softer rocks more easily. The waves undercut cliffs by gnawing away at the bottom, causing them to collapse. Eventually, a small cove widens into a bay.
At the height of the last Ice Age (26,500 years ago), the world sea level was about 120 metres (400 ft) lower than it is today. This was because a huge amount of water was frozen in the vast ice caps that covered large areas of the land.
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