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Looks like a cloud, but we know isn't? >> right. volcanic ash clouds are mixtures of fragments of lava, crystal and volcanic glass along with volcanic gases. they are hot when they erupt, they travel high into the atmosphere and then are carried with the prevailing winds. but it's the solid particulate material that's most dangerous to an aircraft. the jet flying through the cloud will suffer abrasions, as you described, but more severely if enough ash is ingested into the engine, they can actually quit. it's the ash interfering with the operation of the jet engine. >> in 1783, i spent a long ...

Ash that makes it so damaging to aircraft? what's -- what's in that, what looks like a cloud, but we know isn't? >> right. volcanic ash clouds are mixtures of fragments of lava, crystal and volcanic glass along with volcanic gases. they are hot when they erupt, they travel high into the atmosphere and then are carried with the prevailing winds. but it's the sal id particulate matter dangerous to aircraft. they can suffer abrasions, as you described, but more severely if enough ash is ingested into the engines they can actually quit. it's the ash interfering with the operation of the jet engine...

Eruptive histories. >> what is the impact on global climate? >> i would say it's fairly slight with this volcano. the worst eruption, one of the worst eruptions in history occurred in 1783 from locke, to the north, and it covered europe in a sulfur cloud. and that affected european climate for about a year. but it didn't really affect global climate. >> now, the "l.a. times" today reports two of the three eruptions of this volcano have been followed by larger eruptions from a nearby volcano with a much easier name. the science fair blog said the potential eruption of that volcano could send th...

Also other icelandic volcanos have had year-plus. >> what is the impact on global climate? >> i would say it's fairly slight with this volcano. the worst eruption, one of the worst eruptions in history occurred in 1783 from locke, to the north dakota, and it covered europe in a sulfur cloud and that affected european climate for about a year. but it didn't really affect global climate. >> now, the "l.a. times" today reports two of the three eruptions of this volcano have been followed by larger eruptions from a nearby volcano with the much easier name. the science fair blog said the potential ...

>> what is the likely impact on global climate? >> i would say it's probably fairly slight with this volcano. the worst eruption, one of the worst eruptions in history occurred in 1783 from locke which is just to the north. it covered europe in a sulfur cloud and that affected european climate for about a year, but it didn't really affect global climate. >> now, the "l.a. times" today reports two of the three eruptions of this volcano have been followed by larger eruptions from a nearby volcano with the much easier name. "usa today ""science fair blog said the potential eruption of ka kat katl...