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 Two views of a slab of pillow basalt recovered on Dredge 22A from the submarine east rift of Genovesa Island. In the top view, note the shiny glassy crust that forms immediately when the lava is erupted on the seafloor. In the bottom view, note the small holes, called vesicles, that form during the eruption as the gases in the magma escape.


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Two views of a slab of pillow basalt recovered on Dredge 22A from the submarine east rift of Genovesa Island. In the top view, note the shiny glassy crust that forms immediately when the lava is erupted on the seafloor. In the bottom view, note the small holes, called vesicles, that form during the eruption as the gases in the magma escape.

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