Difference between revisions of "Aa"

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[[File:Aa.jpg|right|525px|thumb|Verging on the appearance of pahoehoe, but nearly an image of aa before it congeals.]]
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[[File:Aa.jpg|right|525px|thumb|Verging on the appearance of pahoehoe, but a near image of aa before it congeals.]]
'''Aa''' (pronounced "ah-ah") describes a volcanic terrain with a particularly rough and jagged surface, resulting from a [[Lava|lava]] that cools and solidifies while still in motion. As the forward edge of the flow cools, the interior is yet viscous — this unsolidified lava breaks the surface crust, so the front of the flow becomes a mass of broken and jagged lumps. Pieces of lava crust then roll down slope, adding to the rough and jumbled character.
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'''Aa'''pronounced as "ah-ah," characterizes a volcanic terrain with an exceptionally rugged and jagged surface. This distinctive landscape is the result of [[Lava|lava]] cooling and solidifying while still in motion. As the front edge of the lava flow cools, the interior remains viscous. This unhardened lava breaches the surface crust, causing the leading edge of the flow to transform into a mass of fractured and jagged chunks. Fragments of the lava crust then cascade downhill, contributing to the overall uneven and chaotic nature of the terrain.
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Aa formations can also occur when a lava flow encounters groundwater, causing a rapid conversion of the water into steam, which explosively shatters the lava crust.
  
Aa also forms when a lava flow comes in contact with ground water, which is quickly turned to steam and erupts violently, breaking up the lava crust.
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The remarkably spiky surface of solidified aa renders walking exceedingly challenging and sluggish, restricting [[Humanoid|humanoids]] and most creatures to a [[Movement (stride)|stride]] no greater than one. However, creatures like [[Slime Moulds (sage study)|jellies and oozes]] are unaffected by these treacherous conditions.
  
The incredibly spiny surface of solidified aa makes walking very difficult and slow, disallowing any [[Movement (stride)|stride]] greater than stride-1 for [[Humanoid|humanoids]] and most creaturesCreatures like [[Puddings, Oozes & Jellies|jellies]] are unaffected.
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== Lava Fields ==
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The Hawaiian Islands are home to some of the most prominent aa lava fields.  Kilauea and Mauna Loa, two of the world's most active volcanoes, have created extensive lava fields over the yearsSimilar fields can be found in other volcanic regions worldwide, including Iceland, the Canary Islands, and various parts of the Pacific Ring of Fire. Each region has its own geological and environmental characteristics, creating diverse landscapes.
  
  
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[[Pacific Islands]]
 
[[Pacific Islands]]
  
[[Category: Geology]][[Category: Don't Review until 2024]]
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[[Category: Geology]][[Category: Reviewed]]

Latest revision as of 21:55, 1 November 2023

Verging on the appearance of pahoehoe, but a near image of aa before it congeals.

Aa, pronounced as "ah-ah," characterizes a volcanic terrain with an exceptionally rugged and jagged surface. This distinctive landscape is the result of lava cooling and solidifying while still in motion. As the front edge of the lava flow cools, the interior remains viscous. This unhardened lava breaches the surface crust, causing the leading edge of the flow to transform into a mass of fractured and jagged chunks. Fragments of the lava crust then cascade downhill, contributing to the overall uneven and chaotic nature of the terrain.

Contents

Aa formations can also occur when a lava flow encounters groundwater, causing a rapid conversion of the water into steam, which explosively shatters the lava crust.

The remarkably spiky surface of solidified aa renders walking exceedingly challenging and sluggish, restricting humanoids and most creatures to a stride no greater than one. However, creatures like jellies and oozes are unaffected by these treacherous conditions.

Lava Fields

The Hawaiian Islands are home to some of the most prominent aa lava fields. Kilauea and Mauna Loa, two of the world's most active volcanoes, have created extensive lava fields over the years. Similar fields can be found in other volcanic regions worldwide, including Iceland, the Canary Islands, and various parts of the Pacific Ring of Fire. Each region has its own geological and environmental characteristics, creating diverse landscapes.


See also,
Coral Reef (range)
Geology (sage study)
Jungle (range)
Pacific Islands