Merapi and the other volcanoes of Indonesia, by contrast, are the result of two plates moving together.

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In fact, in several stadiums they already have, moving the cups and plates to compostible versions and removing (yes, removing) 90% of the trash bins, replaced with recycling containers.

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"With a strike-slip event you don't have the same potential hazard for a tsunami as you do with a subduction event because the plates are moving adjacent to each other, " Dutton told OurAmazingPlanet.

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And his 2004 assertion, that "the tectonic plates appear to be moving" within the government, seemed to suggest he thought Tony Blair should have made way for his successor sooner rather than later.

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Eyjafjallajokull, in Iceland, which erupted in April, stopping commercial flights over the Atlantic and Europe for a week, is at a junction where the plates are growing and moving apart, as magma wells up from deep in the Earth.

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The plates change size and position over time, moving at speeds of between 1cm and 10cm every year - about the speed at which fingernails grow.

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This process made cells spread out on the surface of culture plates, in a similar way to cancer cells moving out from a tumour.

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There were green picnic tables set out beneath the shade trees full with foliage, and on this sunny weekend afternoon there were waiters in braided white coats moving swiftly about, balancing trays laden with bottles and pitchers and plates, and men of every age gathered at each of the tables, smoking cigarettes and pipes and cigars and drinking deeply from tall beakers and earthenware mugs.

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