June 15 1991 Mt Pinatubo Eruption Devastates the Philippines

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In this video we look at how the continuous movement of Earth's tectonic plates results in volcanic activity. In a volcanic eruption, super-heated magma from within the earth’s upper mantle works its way to the surface. This most often occurs at tectonic plate boundaries, but some volcanoes can also form over 'hotspots', or weak areas in the earth's crust. • Get the latest headlines: http://www.telegraph.co.uk/ • Subscribe: http://www.youtube.com/subscription_c... • Like us on Facebook:   / telegraph.co.uk   • Follow us on Twitter:   / telegraph   • Follow us on Google+ https://plus.google.com/1028913550727... • Telegraph.co.uk and    / telegraphtv   are websites of The Daily Telegraph, the UK's best-selling quality daily newspaper providing news and analysis on UK and world events, business, sport, lifestyle and culture.

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