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It became active again because a magnitude 7.8 earthquake, shook the Earth 60 miles away (100 kilometers), NorthEast. This earthquake also shook and squeezed the Earth's crust underneath Mount Pinatubo. The earthquake also caused a landslide on Mount Pinatubo; giving the volcano no support to stay underground.

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Q: Why did Mount Pinatubo become active again?
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It's hard to say, But probably, Yes.


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