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Volcanic pipes form as the result of violent eruptions of deep-origin volcanoes. [1] These volcanoes originate at least three times as deep as most other volcanoes, and the resulting magma that is pushed toward the surface is high in magnesium and volatile compounds such as water and carbon dioxide.
South Table Mountain with its capping lava flows, as seen from the Colorado School of Mines campus in Golden. Castle Rock is the prominence to the left of center. Although not necessarily recorded on United States Geological Survey maps, several historically named features are part of South Table Mountain:
Lava tubes are the most common and extensive type of lava cave. Lava tubes usually form in pahoehoe lava flows, though exceptions exist. As the lava is emitted from the vent area, it spreads in the path of least resistance. The outer layers of the lava harden, while the interior forms horizontal conduits that channel the advance of the flow.
The word lava comes from Italian and is probably derived from the Latin word labes, which means a fall or slide. [2] [3] An early use of the word in connection with extrusion of magma from below the surface is found in a short account of the 1737 eruption of Vesuvius, written by Francesco Serao, who described "a flow of fiery lava" as an analogy to the flow of water and mud down the flanks of ...
A broad lava-flow field often forms a lava tube system that consists of a main lava tube and a series of smaller tubes that supply lava to the front of one or more separate flows. When the supply of lava stops at the end of an eruption, or lava is diverted elsewhere, lava in the tube system sometimes drains downslope and leaves partially or ...
Boyd Cave is between 75,000 and 400,000 years old. [2] Similar to Skeleton Cave, it is a well preserved lava tube with little interior collapse and exhibits pahoehoe flow structures on its walls, ceiling and floors.
17368. Area code: 717: FIPS code: 42-86640: Website: ... The final bridge, the Pennsylvania Railroad Bridge, was a steel open-air bridge constructed in 1896. It was ...
A fissure vent, also known as a volcanic fissure, eruption fissure or simply a fissure, is a linear volcanic vent through which lava erupts, usually without any explosive activity. The vent is often a few metres wide and may be many kilometres long. Fissure vents can cause large flood basalts which run first in lava channels and later in lava ...