Sea level does not always stay the same. During the last Ice Age, 18,000 years ago, sea level was about 122m (400ft) lower than it is today. It was possible to walk between England and France. Since then, the sea level has risen by about 8 cm (3in) every 100 years.

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Source: https://www.pitara.com/non-fiction-for-kids/did-you-know-for-kids/sea-level-does-not-always-stay-the-same/

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