Alternative form of aa [(volcanology) A form of lava flow associated with Hawaiian-type volcanoes, consisting of basaltic rock, usually dark-colored with a jagged and loose, clinkery surface. Compare pahoehoe.]
(volcanology) A form of lava flow associated with Hawaiian-type volcanoes, consisting of basaltic rock, usually dark-colored with a jagged and loose, clinkery surface. Compare pahoehoe.
(geology) The basin-like opening or mouth of a volcano, through which the chief eruption comes; similarly, the mouth of a geyser, about which a cone of silica is often built up.
(geology) A structure left by a type of soft-sediment deformation in which sediment saturated with water flowed upward due to forces put on it from above.
(planetology, geology, volcanology) A boiling natural spring which throws forth jets of water, mud, etc., at frequent intervals, driven upwards by the expansive power of steam.
(geology) A natural volcanic pipe composed of kimberlite, by which geological matter from deep within the Earth can be projected violently to the surface.
(obsolete, geology) Flowing mud associated with a volcanic eruption (especially in South America), formed when snow or a lake near a volcano is disrupted, or when rain or steam mixes with soil or ash during an eruption.
A form of lava flow of basaltic rock, usually dark-colored with a smooth or ropey surface. It is one of two chief forms of lava flow emitted from volcanoes of the Hawaiian type, the other form being aa.
Alternative form of pahoehoe [A form of lava flow of basaltic rock, usually dark-colored with a smooth or ropey surface. It is one of two chief forms of lava flow emitted from volcanoes of the Hawaiian type, the other form being aa.]
The caldera or crater (dish-shaped depression) atop a volcano, especially an extraterrestrial one; also used in the names of extraterrestrial volcanoes which have such a caldera.
The volcanic glass threads or fibers formed when small particles of molten material are thrown into the air and spun out by the wind into long hair-like strands.
A light, porous type of pyroclastic igneous rock, formed during explosive volcanic eruptions when liquid lava is ejected into water or air as a froth containing masses of gas bubbles. As the lava solidifies, the bubbles are frozen into the rock.
(geology) The layer of loose rock, dust, sand, and soil, resting on the bedrock, that constitutes the surface layer of most dry land on Earth, the Moon, and other large solid aggregated celestial objects. Submarine regolith also exists.
A feature of some volcanoes, especially the shield volcanoes of Hawaii, in which a linear series of fissures in the volcanic edifice allows lava to erupt from the volcano's flank instead of from its summit.
The border of an igneous mass, usually characterized by a finer grain or glassy texture which is produced by the chilling of the molten rock by the cold country rock.
(geology) A type of rock column comprising discrete layers, with the top layers being wider than the base due to greater resistance to erosion and weathering.
(astronomy) A large impact crater that has a relatively flat floor, surrounded by a wall
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