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Earthquakes - what are they and what do they tell us about our planet? Earthquakes happen when a line of weakness breaks in the earth's rock, known as a fault. The result is a huge release of energy. The ring of fire is the most earthquake-prone area of the planet, which explains why Japan has so many earthquakes. This is a programme from the ÃÛÑ¿´«Ã½ World Service Archive and was originally broadcast in 1999.
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