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.
Close-up of a rock sample: a block of juvenile magma (from the dome or lava flow) made of blackish, glassy lava with a xenolith of lighter, more feldspar-rich lava which is presumably from an older batch of magma that had mingled with the younger (black) one; possibly a clue to the dynamics of the eruption? (Photo: Tom Pfeiffer)
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