The airport on the Spanish island of La Palma shut down on Saturday because of an ash cloud spewing out of a volcano that has been erupting for a week, and scientists said another volcanic vent opened up, exposing islanders to possible new dangers.The intensity of the eruption that began Sept. 19 has increased in recent days, prompting the evacuation of three additional villages on the island, part of Spain’s Canary Islands archipelago in the Atlantic Ocean off northwest Africa. Almost 7,000…

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