Volcano

Volcano

A vent or opening in a planet's surface that lets out pressurized molten rocks or magma, and gases from the inner core. Volcanoes come in various shapes and structure, but the most common ones are mountain-like structures with a crater at the summit.

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Volcano

basic

Natural environment; Volcano

A descriptive term applied to igneous rocks (basalt and gabbro) with silica (SiO2) between 44% and 52%.

bench

Natural environment; Volcano

The unstable, newly-formed front of a lava delta.

blister

Natural environment; Volcano

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

Natural environment; Volcano

Angular chunk of solid rock ejected during an eruption.

bomb

Natural environment; Volcano

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 ...

caldera

Natural environment; Volcano

The Spanish word for cauldron, a basin-shaped volcanic depression; by definition, at least a mile in diameter. Such large depressions are typically formed by the subsidence of volcanoes. Crater ...

capping stage

Natural environment; Volcano

Refers to a stage in the evolution of a typical Hawaiian volcano during which alkalic, basalt, and related rocks build a steeply, sloping cap on the main shield of the volcano. Eruptions are less ...