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Pahoehoe lava is a relatively smooth lava flow that can be billowy or ropey. They can move as one sheet, by the advancement of "toes", or as a snaking lava column. [10] A'a lava flows are denser and more viscous than pahoehoe, and tend to move slower. Flows can measure 2 to 20 m (7 to 66 ft) thick.
Pahoehoe lava is smooth and ropy while Aa lava is blocky and hard. Lava flows normally follow the topography, sinking into depressions and valleys and flowing down the volcano. Lava flows will bury roads, farmlands and other forms of personal property. [1] This lava could destroy homes, cars, and lives standing in the way. [2]
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 ...
Hawaii's Big Island continues to be plagued by volcanic eruptions, which have destroyed several homes and forced roughly 2,000 people to evacuate.
Around Aberdeen, lava flows from diverse vents form a large field with aa and pahoehoe forms [11] and neatly preserved surface features. [9] Lava flows reach lengths of 9 kilometres (5.6 mi) [3] and have thicknesses of 0.01–30 metres (0.39 in – 98 ft 5.10 in) and sometimes lava flows from separate cones overlap, such as in Papoose Canyon. [8]
Older lava flows have been completely flattened by erosion, while more recent ones still display fresh surface structures [14] and some of the recent flows flowed out of the mountains into the surrounding landscapes. [15] Surface features include both aa lava traits and pahoehoe lava traits, [16] and there are lava channels, [17] skylights and ...
Another process is magma mixing between felsic rhyolitic and mafic basaltic magmas in an intermediate reservoir before emplacement or lava flow. [64] If the erupted magma contains <52% and >45% silica, the lava is called mafic (because it contains higher percentages of magnesium (Mg) and iron (Fe)) or basaltic. These lavas are usually hotter ...
Toward the sea the road crosses a pāhoehoe lava flow. In the early 2000s, steam from lava tubes could be seen. [5] Lava continues to change the landscape. The hillside flows date from the 1969–74 Mauna Ulu eruptions. The foreground pahoehoe lava is from the 2003 flow. Lava flows from the Kīlauea volcano eruption closed the road in 1969. In ...