Definitions
Volcano Term Definitions
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- Basalt
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Volcanic rock (or lava) that characteristically is dark in color, contains 45% to 54% silica, and generally is rich in iron and magnesium.
- Basement
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The undifferentiated rocks that underlie the rocks of interest in an area.
- Bench
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The unstable, newly-formed front of a lava delta.
- Blister
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A swelling of the crust of a lava flow formed by the puffing-up of gas or vapor beneath the flow. Blisters are about 1 meter in diameter and hollow.
- Block
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Angular chunk of solid rock ejected during an eruption.
- Bomb
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Fragment of molten or semi-molten rock, 2 1/2 inches to many feet in diameter, which is blown out during an eruption. Because of their plastic condition, bombs are often modified in shape during their flight or upon impact.
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