Oct 26, 2022 · When you see lava flow or walk on old lava, the two types of flows are pahoehoe and a’a. Pahoehoe (meaning “smooth lava in Hawaiian) is smooth, undulating, or ropey. A’a is rough, rubbly, and often sharp.

Nov 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 …

ʻAʻā (also spelled aa, aʻa, ʻaʻa, and a-aa, and pronounced [ʔəˈʔaː] or / ˈ ɑː (ʔ) ɑː /) is one of three basic types of flow lava. ʻAʻā is basaltic lava characterized by a rough or rubbly surface composed of broken lava blocks called clinker.

In 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… Read More

Aug 12, 2023 · There are six lava flow types or morphologies: pahoehoe, aa, blocky lava, pillow lava, sheet flow, and lobate. The first three are subaerial, and the last three are subaqueous (submarine, subglacial, and other subaqueous environments).

Aug 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 …

‘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.

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.

May 6, 2010 · There are three types of basalt lava flows: pillow, pahoehoe, and a'a. Pillow lavas are volumetrically the most abundant type because they are erupted at mid-ocean ridges and because they make up the submarine portion of seamounts and large intraplate volcanoes, like the Hawaii-Emperor seamount chain. Image Credit: Gordon Tribble/USGS.

Aug 2, 2023 · Pahoehoes have continuous, smooth, ropy, or hummocky glassy surfaces, while aa lava flows have a surface with sharp, rough, angular clinkers.