Blue flames from methane gas seen near Hawaii's Kilauea volcano. "When lava buries plants and shrubs, methane gas is produced as a byproduct of burning vegetation," the U.S. Geological Survey said in a video. Kilauea has erupted again this week, sending out fresh lava and causing more havoc on the island. The flow near the Leilani Estates neighborhood had already destroyed at least 40 homes since it began early this month.

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