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video shows clouds of gas emits into the atmosphere displaying lightning. that ash came back to earth covering homes and vehicles, but scientists are watching closely for a different reason. vulcan ilk gases have been shown to have a cooling effect. the massive eruption of mount pen ta'u beau in 1991 lowered global temperatures by as much as 1 degree but they say smaller eruptions like this one in chill key can also make a different. allegra legrand is a climate expert with nasa. >> let's see the gases make it to the stratosphere. they literally reflect the sunlight that prevent it from warming it up. this is a small component of why we're not as warm today as the climate models predicted we would be seven years ago. >> there are now concerns over a third eruption. residents in santiago some 600 miles away already experienced a shower of volcanic ash. for "cbs this morning: saturday," michelle miller new york. >>> coming up later, scary fiemgds about a volcano much bigger than that one and it right here in the united states. >>> about 100,000 people marched. it's believed many armenians died. >>> the death penalty trial into the colorado movie theater massacre is set to begin mo