2022年10月26日 · 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.

2022年11月30日 · 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 …

2023年8月1日 · 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 …

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.

2023年8月12日 · 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).

Mafic (ferromagnesian, dark-coloured) lavas such as basalt characteristically form flows known by the Hawaiian names pahoehoe and aa (or a’a). Pahoehoe lava flows are characterized by smooth, gently undulating, or broadly hummocky surfaces.

1999年5月27日 · 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 …

‘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.

2023年8月2日 · Pahoehoes have continuous, smooth, ropy, or hummocky glassy surfaces, while aa lava flows have a surface with sharp, rough, angular clinkers.

Aa (pronounced “ah-ah”) lava is more solidified and flows sluggishly compared to its more fluid counterpart, pahoehoe. Aa consists of rough, jagged, uneven pieces that tumble forward and over each other as the flow moves down the slope.