Why does the Hawaii Kilauea volcano keep erupting?

Hawaii's Kilauea volcano could soon send boulders and ash shooting out of its summit crater in the kind of explosive eruption last displayed nearly a century ago. CBC science commentator Bob McDonald explains why Kilauea has been continually erupting for centuries and how it compares to other volcanoes. »»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS Connect with CBC News Online: For breaking news, video, audio and in-depth coverage: http://bit.ly/1Z0m6iX Find

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