Pahoehoe is a type of basaltic lava flow. The kind of eruption that causes pahoehoe is a quiet volcanic eruption.
Quiet Eruptions produce pahoehoe lava. It also can produce Aa lava. Pahoehoe is a fast moving and a hot lava. Pahoehoe looks like wrinkles once it starts to cool down.
Pahoehoe does not come from any specific type of volcano. It is just a type of lava that has a smooth, ropey surface. However, it is most often associated with shield volcanoes.
a quiet eruption
Quiet eruptions
all lava
Pahoehoe and AA lava are produced by quiet eruptions. This means that instead of a blast or explosion, the lava just flows out of the volcano. Pahoehoe lava is hot and flows quickly. AA lava is cooler in temperature and doesn't flow as quickly.
Pahoehoe is faster moving lava and AA is slower moving lava. Both types are found in basaltic type eruptions. They have different appearances. Pahoehoe is smooth and ropey where as AA is chunky and rough.(much like top of trees) Often a pahoehoe flow can change to an AA flow depending upon the type of slope it encounters. The steeper the slope the more likely AA lava will be present. Aa has more viscosity than Pahoehoe.
Pahoehoe and a'a refer to different texutres of lava flows. Although cindercones can produce lava flows, their main mode of eruption is called "fire fountaining" which tends to produce chunks of lava called scoria, rather than pahoehoe or a'a.
Blocky Lava, Pahoehoe Lava, Aa Lava, Pillow Lava
basaltic lava can form a'a, pahoehoe, or pillow lava.
Pahoehoe and another
Pahoehoe is hot, fast-moving lava that has a low viscosity. AA lava has a cooler temperature and moves more slowly. Quiet eruptions are the type that produce these two types of lava.
Quiet eruptions
Pahoehoe and AA lava are produced by quiet eruptions. This means that instead of a blast or explosion, the lava just flows out of the volcano. Pahoehoe lava is hot and flows quickly. AA lava is cooler in temperature and doesn't flow as quickly.
Pahoehoe is faster moving lava and AA is slower moving lava. Both types are found in basaltic type eruptions. They have different appearances. Pahoehoe is smooth and ropey where as AA is chunky and rough.(much like top of trees) Often a pahoehoe flow can change to an AA flow depending upon the type of slope it encounters. The steeper the slope the more likely AA lava will be present. Aa has more viscosity than Pahoehoe.
Pahoehoe lava, Aa lava, and Blocky lava
Not usually. Pahoehoe refers specifically to a lava flows. These can occur in mildly explosive eruptions, but usually explosive eruptions to not produce lava flows. Instreat they produce clouds of ash with some lapilli and pumice. Pryoclastic flows often result. These are fast-moving avalanches of superheated ash, gas and pumice. These form a kind of volcanic rock called tuff.
Pahoehoe and a'a refer to different texutres of lava flows. Although cindercones can produce lava flows, their main mode of eruption is called "fire fountaining" which tends to produce chunks of lava called scoria, rather than pahoehoe or a'a.
Blocky Lava, Pahoehoe Lava, Aa Lava, Pillow Lava
Pahoehoe
The difference between Pahoehoe lava and AA lava is that pahoehoe lava is smooth and AA lava is jagged.
Lava flows of pahoehoe and aa indicate that the eruption was effusive ("quiet") rather than explosive, or only very mildly explosive.