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Pahoehoe lava is less viscous than aa lava. This lower viscosity allows pahoehoe to flow smoothly and form a rope-like texture, while aa lava, being more viscous, breaks apart as it moves, creating a rough, jagged surface. The difference in viscosity is largely due to the temperature and gas content of the lava as it erupts.
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What type of lava does Mount Rainier have Aa or Pahoehoe?
Mount Rainier primarily has andesitic lava, which can exhibit characteristics of both Aa and Pahoehoe types. However, the predominant lava flows associated with Mount Rainier are typically more akin to Aa, as they are often cooler and more viscous, resulting in a rough, jagged surface. Pahoehoe, which is smoother and more fluid, can occur but is less common in this region.
Why is pahoehoe lava slower moving than Aa lava?
Pahoehoe lava has a lower viscosity due to its higher temperature, which allows it to flow more smoothly and form a rope-like texture. Aa lava, on the other hand, has a higher viscosity because it is cooler and more viscous, leading to a blocky and rough appearance that slows down its movement.
Is the lava of Krakatoa AAA or pahoehoe?
The lava of Krakatoa volcano is typically AAA lava, which is characterized by its thick and viscous texture. This type of lava tends to flow slowly and can create steep-sided volcanoes. Pahoehoe lava, on the other hand, is more fluid and forms smooth, rope-like textures when it cools.
What is the difference between pahoehoe and lava?
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.
What are the differences between the pahoehoe and AA?
Aa is slower, cooler, and has less sillica than pahoehoe. Pahoehoe is faster and moves quickly, and phoehoe has more silica, and is also darker than Aa
Does kilauea have pahoehoe or AAA lava?
Kilauea produced both pahoehoe and a'a. These terms refer to the texture that a basaltic lava flow can take on and do not mean a difference in composition. Ofteb Kilauea's lava starts out as pahoehoe and becomes a'a as it cools an becomes more viscous.
What type of lava does Mount Rainier have Aa or Pahoehoe?
Mount Rainier primarily has andesitic lava, which can exhibit characteristics of both Aa and Pahoehoe types. However, the predominant lava flows associated with Mount Rainier are typically more akin to Aa, as they are often cooler and more viscous, resulting in a rough, jagged surface. Pahoehoe, which is smoother and more fluid, can occur but is less common in this region.
Why is pahoehoe lava slower moving than Aa lava?
Pahoehoe lava has a lower viscosity due to its higher temperature, which allows it to flow more smoothly and form a rope-like texture. Aa lava, on the other hand, has a higher viscosity because it is cooler and more viscous, leading to a blocky and rough appearance that slows down its movement.
Is the lava of Krakatoa AAA or pahoehoe?
The lava of Krakatoa volcano is typically AAA lava, which is characterized by its thick and viscous texture. This type of lava tends to flow slowly and can create steep-sided volcanoes. Pahoehoe lava, on the other hand, is more fluid and forms smooth, rope-like textures when it cools.
What is the difference between pahoehoe and lava?
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.
What are the differences between the pahoehoe and AA?
Aa is slower, cooler, and has less sillica than pahoehoe. Pahoehoe is faster and moves quickly, and phoehoe has more silica, and is also darker than Aa
What do lava flows made of pahoehoe and a indicate about the type of volcanic eruption that occurd?
The lava structures of a'a and pahoehoe indicate the viscosity (resistance to flow) and temperature of the lava as it was erupting. The pahoehoe structures form when the lava is more fluid and hotter and a thin crust is able to congeal before deformation by the heat of the interior of the flow. The a'a structures form when the lava is slightly cooler and less fluid as it travels downslope. A pahoehoe-forming lava can cool and become an a'a lava as it travels downslope, losing heat and becoming more viscous (less fluid). It doesn't so much tell us about the eruption itself as it tells us about the temperature and viscosity of the lava.
Are Aa flows thinner than pahoehoe flows?
Yes, aa flows are generally thicker and more viscous than pahoehoe flows. Aa flows have a rough, jagged surface and are formed from more viscous lava that cools and solidifies rapidly. In contrast, pahoehoe flows are smoother and more fluid, allowing them to spread out more easily and create a ropy texture. The difference in viscosity is primarily due to the temperature and gas content of the lava at the time of eruption.
Name the two types of lava?
The two main types of lava are pahoehoe, which has a smooth, rope-like texture, and aa, which has a rough, jagged texture. They differ in their viscosity and flow characteristics, with pahoehoe being more fluid and aa being more viscous.
What is the relationship with silica viscosity and lava flow?
An increase in the silica content of a lava increases it's viscosity. Viscosity can be thought of as a fluids resistance during deformation to shear or tensile stress, or in more simple terms, how easy or difficult it is to make a fluid flow. As viscosity increases, a fluid will flow less easily, so a lava with a high silica content will be more viscous and will flow less easily / more slowly than a low silica lava.
What type of lava is least likely to form a pyroclastic flow?
Pahoehoe lava, which has a low viscosity and flows more easily, is less likely to form a pyroclastic flow compared to a'a lava, which is more viscous and tends to fragment into pyroclastic material when flowing.
Does mt st Helens have pahoehoe or AA lava?
Niether. Pahoehoe and a'a are both varieties of basaltic lava. The material from Pinatobo is of a dacitic composition, which is much more viscous than a'a or pahoehoe. It tends to erupt explosively, producing ash and pumice rather than lava flows. When dacitic lava does flow it creates a block lava flow.
