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1820.

1820 is the last recoded erruption, not the first.

Rock layers of the volcano are 500,000 years old, therefore

one may conclude that the first eruption would have been

approximately 500,000 years ago.

Mt Rainier is predicted to erupt again, has hot springs and local authorties

have emegency plans prepared in the event of a new eruption.

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11y ago

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