By Marco Garcia VOLCANO, Hawaii (Reuters) - The restive Kilauea Volcano belched clouds of ash into the skies over Hawaii's Big Island twice more on Wednesday as civil defense authorities reported that pressurized geothermal wells at a nearby power plant had been secured from approaching lava. The latest back-to-back upheavals of ash from the main summit crater of Kilauea -- one before dawn and another several hours later -- came on the 21st day of what geologists rank as one of the biggest eruption cycles in a century from one of the world's most active volcanoes. The Hawaii County Civil Defense agency warned in its latest bulletin that residents downwind of Kilauea should take care to avoid exposure to ash, which can cause eye irritation and breathing difficulties, particularly in people with respiratory problems.



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