Scientists: Growth of bulge on Oregon volcano slows down

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South Sister bulge slows down
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  • South Sister bulge slows down
  • South Sister bulge slows down
  • South Sister bulge slows down
  • South Sister bulge slows down
  • South Sister bulge slows down
  • South Sister bulge slows down
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South Sister bulge slows down
South Sister hasn't erupted in a long time