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A'a lava has a generally low silica content. Having low silica content means that it also has a low viscosity level. Having a low viscosity level means that it flows easily.
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Does AA lava have a lot of silica?
no. AA has a relatively low silica content level.
What type of lava did Eyjafjallajökull produce?
It had high silica lava, or AA lava.
Name the two types of lava?
Blocky Lava, Pahoehoe Lava, Aa Lava, Pillow Lava
Why is the silica content of lava important?
The more silica crystal within the magma, the more viscous the magma is, because of crystals sticking together. So magma with low silica content is runny, and wiht just flow gently out of a volcano, like in hawai, but viscous (sticky, like honey) magma will not, and gas gets trapped within it, and then explodes out, cause large scale explosive erruptions.
What type of material do explosive volcanoes produce?
An explosive eruption is caused by magma with a high content of water and silica. Non-explosive eruptions are caused by either lava because it is a thicker consistency, or magma with a low content of water and silica.
What do lava flow made of pahoehoe and AA indicate about the type of volcanic eruptions that occured?
It was a quiet eruption and it was low in silica
What type of lava is erupted from Mount Kilimanjaro?
Mt. Fuji is Japan's highest mountain. The lava that comes out of this volcano is silica-poor lava that is very thick and chunky.
What is the difference between pahoehoe and AA lava?
The difference between Pahoehoe lava and AA lava is that pahoehoe lava is smooth and AA lava is jagged.
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
Is pumice pahoehoe or AA?
pahoehoe is smooth and rope like sufaces. Aa is sharp and jaged last pillow lava is pressure billds up in side the lava untill it craks then it pours out forming yet another pillow on the last one.
Is a composite volcano made of Aa lava?
No. If a'a is present it will usually be only a minor portion of the volcano. A'a and pahoehoe are low-viscosity lavas with a low silica content They are usually found in shield volcanoes. A composite volcano is usually primarily composed of composed of tepha (loose ash, pumice, and lapilli), tuff (welded ash), and block lava (very viscous lava flows). This material is usually more viscous with more silica than what goes into a'a and pahoehoe.
Did AA lava form composite volcanoes?
No, generally not. Most composite volcanoes erupt more viscous, high-silica material than what would form a'a. So block lava would be more common.
