lava tube A hollow passage beneath the surface of a solidified lava flow, formed by the withdrawal of molten lava from a former distributory tunnel, which fed lava below the stationary surface of the flow to the advancing flow margin, sometimes transporting the lava over long distances. Tubes range in width from less than one metre to more than 30m and in height up to 15m. They can be tens of kilometres long, e.g. in Victoria, Australia. Most tubes are developed in flows displaying pahoehoe surface morphology, although they can develop in flows with aa surface morphology. Mount Etna, Sicily, has examples of both.
More From encyclopedia.com
overland flow , overland flow See SURFACE RUNOFF. overland flow See surface run-off. Baseflow , baseflow(dry-weather flow) In a stream or river, the flow of water derived from the seepage of groundwater, and/or through-flow into the surface wate… Hypopycnal Flow , hypopycnal flow Bankfull Flow , bankfull flow Lava , Lava Lava is molten rock that has been extruded onto Earth's surface. Before it reaches the surface, lava is called magma . Magma contains crystals ,… Flow , Flow BIBLIOGRAPHY Embedded within and critical to the burgeoning field of positive psychology, the concept of flow represents an optimal state of con…
About this article
Updated About encyclopedia.com content Print Article
You Might Also Like