The Volcano Adventure Guide: Excellent information and background for anyone wishing to visit active volcanoes safely and enjoyably. The book presents guidelines to visiting 42 different volcanoes around the world.
Much of the visible incandescence of the lava flows comes from the near-continous, but mostly small rockfalls, as blocks detach from the surface and flanks of the viscous lava flows. (Photo: Tom Pfeiffer)
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