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Sometimes the tides are very high and this can be a big problem for the towns near the cost. 1_______. London has a special mechanical ‘wall’ to stop the tide coming into the city.
There are big differences between ‘high tide’ and ‘low tide’ in Britain. In some places, the sea goes out a very long way. 2_______. As the tide comes in and goes out, it cleans the beaches.
In the ports, the ships wait for the high tide. 3______.
The tides can also help to make electricity.
4_______.
These towns have very high walls to stop the sea.
In the summer, for example, you can walk from England to Wales!
At low tide, it is impossible to go in or out of the port.
There are plans to make electricity in the sea near Bristol.