Mount Etna erupts, spurting lava into skybr br Streams of red hot lava spewed from Mount Etna, covering the sky in black smoke and ash early on Sunday (July 7).br br Volcanic activity from Etna's 'Voragine' crater has intensified this week, with vigorous explosions following a four-year dormancy.br br Etna and Stromboli are the most explosive volcanoes, erupting more violently due to minute variations in the chemical composition of their magma.br br The 3,330-metre-high volcano Mount Etna, Europe's tallest active volcano, is believed to have the longest documented history of eruptions amongst all volcanoes, with records dating back to as early as 425 B.C.