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In fact, it is common for a flow that leaves the vent as pahoehoe to change to aa as it progresses downslope.The greater the viscosity and the greater the stirring of the liquid (as by rapid flow down a steep slope), the greater the tendency for the material to change from pahoehoe to aa. These resemble aa in having tops consisting largely of loose rubble, but the fragments are more regular in shape, most of them polygons with fairly smooth sides. Calls cost 36p per min plus your network access charge. A list of all the girls who are online and ready for your call can be seen below.These US cities are at risk in the event of another huge Yellowstone volcanic eruption.
Pyroclastic flows, which are low-viscosity, fluidized mixtures of hot but solid volcanic fragments and hot gas, are often described in newspaper accounts as lava flows. Molten lava flows are relatively high-viscosity liquids, and most of them advance slowly (a few metres per minute to less than a metre per day).In millennia past, the area had been covered by up to three feet of ash, which moved at “hurricane speeds” and boasted terrifyingly-hot temperatures as it flew across the country.Doctor Hank Heasler, park geologist at Yellowstone, said: “This ash when it comes up is maybe about 2,000 degrees Fahrenheit.“So very hot and then it moves laterally at hurricane force winds and that’s what causes a wide zone of destruction.”Denver is home 600,000 people with as many as two million others living in the metro area surrounding Colorado’s capital.More than 180,000 people live in the city with more than one million inhabiting the surround metro area.The damage would increase exponentially in the smaller towns and cities nearer Yellowstone volcano itself.