Aa | lava flow | Britannica
WEBIn volcano: Lava flows. …smooth to ropy surface; and aa (or a’a), a more viscous flow whose surface is covered by thick, jumbled piles of loose, sharp blocks. Both types have the same chemical composition; the difference seems to be in the eruptive temperature and the speed of movement of the flow. As much….
USGS: Volcano Hazards Program Glossary - AA
WEB‘A‘ā (pronounced "ah-ah") is a Hawaiian term for lava flows that have a rough rubbly surface composed of broken lava blocks called clinkers. The incredibly spiny surface of a solidified ‘A‘ā flow makes walking very difficult and slow. The clinkery surface actually covers a massive dense core, which is the most active part of the flow.
What Does an Aa Lava Flow Look Like and How Does It Form?
WEBAug 1, 2023 · Aa is a subaerial lava flow whose surface is characterized by sharp and rough or jagged irregular blocks/rubbles known as clinkers or spinose. These loose, broken, contorted, spiny, or angular fragments or clinkers have sharp edges, making them dangerous to walk on without shoes.
Volcano Watch — Pāhoehoe and ‘a‘ā lava flows
WEBMay 27, 1999 · The two main types of lava, pāhoehoe and ‘a‘ā, differ in various properties, such as crystal and gas bubble content, as well as having slight differences in temperature. These properties, along with the steepness of the underlying slope, determine the ease with which a lava flow moves.
Types of Lava – Pahoehoe and A’a - Science Notes and Projects
WEBOct 26, 2022 · The three types of lava flow are pahoehoe, a’a, and pillow lava. Most lava flow is mafic or basaltic. Pahoehoe is smooth, a’a is rough, and pillow lava is rounded and only forms under water. Block lava doesn’t exactly flow, but it is another common form.
Pāhoehoe and ʻAʻā Lava | Big Island Hawaii | Facts and Trivia
WEBNov 30, 2022 · There are two different kinds of solidified lava you can encounter on the Big Island: pāhoehoe (pronounced ‘paw hoey hoey’) and ʻaʻā (pronounced ‘ah ah’). The surface of aʻā lava is sharp, rough, and ‘clinkery’, while Pāhoehoe lava surfaces have more smooth, billowy, or ropy crust.
'A'a | Volcano World | Oregon State University
WEBflow4.gif. Map of the 1859 Mauna Loa "paired" lava flow. The 'a'a flow (orange) was active for 16 days, advanced at an average flow-front velocity of 133 meters/hour, and erupted at a volumetric flow rate of 208 cubic meters/sec.
What are the different types of basaltic lava flows and ... - Volcano World
WEBMay 6, 2010 · A'a is characterized by a rough, jagged, spinose, and generally clinkery surface. Aa lava flows tend to be relatively thick compared to pahoehoe flows. During the early episodes of the current eruption of Kilauea volcano, aa flows up to 36 feet (11 m) thick surged through the Royal Gardens subdivision at rates as great as 108 ft/min (33 m/min).
Volcanic pahoehoe and aa at Kilauea, Hawaii | Britannica
WEBLava flowing toward the sea from Kilauea volcano, Hawaii, takes two recognizable forms: fast-flowing ropy lava called pahoehoe and thick blocky lava called aa.
Aa - Vocab, Definition, and Must Know Facts | Fiveable
WEBAa is a type of lava flow characterized by its rough, jagged surface and blocky texture. This form of lava is highly viscous, leading to a slower movement as it cools and solidifies, often resulting in sharp edges and clumps.