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| ('nbcnews.com/mach/science/mount-etna-sliding-sea-history-shows-could-be-catastrophic-ncna925051', 10) | The sensors also detected motion in parts of the volcano 's flank that lie underwater , far from the heart of >>>Etna 's volcanic activity<<< — an unexpected finding that suggests that magma alone ca n't account for the continuing slide . |
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