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Eruptive activity of Etna is distinguished in two broad categories - summit eruptions, which take place at the summit craters (also called terminal eruptions) and in their vicinity (subterminal eruptions), and flank eruptions, which occur at altitudes from approximately 2800 m to a few hundred metres above sea level. Summit activity is more or less continuous over periods of years or even decades, and occasionally punctuated by powerful explosive episodes (lava fountains and subplinian events). By contrast, flank eruptions take place at irregular intervals, producing lava effusion commonly associated with weak explosive activity.&#13;
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                    <gmx:Anchor xlink:href="http://data.europa.eu/eli/reg/2010/1089">Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services</gmx:Anchor>
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