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A 7.1 magnitude earthquake has struck Mexico, toppling buildings in the capital Mexico City and killing hundreds. Exactly 32 years ago thousands died in an earthquake there, and it's also less than a fortnight after another quake in the country killed over 90 people. Â鶹Éç Minute asked David Rothery, a Professor of Planetary Geosciences at the Open University, about why the country is so susceptible to earthquakes. Photo: Rescuers, firefighters, policemen, soldiers and volunteers remove rubble and debris from a flattened building in Mexico City Credit: RONALDO SCHEMIDT/AFP/Getty Images