Pahoehoe is lava that in solidified form is characterized by a smooth, billowy, or ropy surface, while
aa is lava
that has a rough, jagged, spiny, and generally clinkery surface. In thick aa flows, the rubbly surface of loose clinkers and blocks hides a massive, relatively dense interior.
What is the difference between aa lava and pahoehoe lava quizlet?
What is the difference between Pahoehoe and Aa lava?
Pahoehoe lava is smoother and flows faster than Aa lava
. Aa is much slower and hardens into a jagged surface while pahoehoe lava hardens into a smooth surface.
What is the difference between aa and pahoehoe lava flows which moves faster?
What is the difference between Pahoehoe and AA?
Pahoehoe lava cools slowly while AA lava cools quickly
. AA lava moves fast whereas Pahoehoe moves slowly. In the case of AA lava flow, gases have escaped from the upper surface creating clinkers and jagged outer structure.
Can aa lava turn into pahoehoe?
Only low-viscosity (usually basaltic) lava can form pahoehoe
. Aa lava is much more common and is not as picky about the composition of lava flow. Aa lava can be basaltic, andesitic, tephritic, etc.
What is an aa lava flow?
‘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.
What is the major difference between magma and lava?
Scientists use the term magma for molten rock that is underground and lava for molten rock that
breaks through the Earth’s surface
.
Why are magma and lava not considered rocks?
Magma and lava both refer to
molten
rock from which igneous rocks form. However, magma refers to molten rock below Earth’s surface, and lava refers to molten rock at the surface.
What is not a major type of volcano?
Which of these is not a major type of volcano?
Mount Rainier
.
Why is it called aa lava?
The smooth variety is called pahoehoe, and the rougher variety is known as a’a (pronounced ah-ah). A’a is a Hawaiian word meaning “stony with rough lava”. … During an eruption,
a’a lava comes out of the volcano as a very thick (viscous) lava that travels very slowly
. The inside of an a’a lava flow is thick and dense.
What’s the Hawaiian word for lava?
Pāhoehoe and ʻaʻā
are both Hawaiian words that are used worldwide to describe these kinds of lava.
What kinds of volcanoes will never erupt again?
Volcanoes are classified as active, dormant, or
extinct
. Active volcanoes have a recent history of eruptions; they are likely to erupt again. Dormant volcanoes have not erupted for a very long time but may erupt at a future time. Extinct volcanoes are not expected to erupt in the future.
What type of lava flows the fastest?
PAHOEHOE
– has a shiny, smooth, glassy surface. It tends to be more fluid (lower viscosity), hence flows more quickly and produces thinner flows (typically 1-3 m).
What does pahoehoe lava look like?
Pahoehoe lava flows are characterized by
smooth, gently undulating, or broadly hummocky surfaces
. The liquid lava flowing beneath a thin, still-plastic crust drags and wrinkles it into tapestry-like folds and rolls resembling twisted rope.
What are the three types of volcano?
There are three types of volcanoes:
cinder cones (also called spatter cones), composite volcanoes (also called stratovolcanoes), and shield volcanoes
. Figure 11.22 illustrates the size and shape differences amongst these volcanoes. Shield volcanoes, which get their name from their broad rounded shape, are the largest.
What are the two types of lava flows?
Lavas, particularly basaltic ones, come in two primary types:
pahoehoe (pronounced ‘paw-hoey-hoey”) and aa (pronounced “ah-ah”)
. Both names, like a number of volcanological terms, are of Hawaiian origin. A third type, pillow lava, forms during submarine eruptions.
How can you identify an individual lava flow?
The only way to absolutely know that the flows you’re looking at are pillow lavas rather than pahoehoe toes, is to
find submarine sediments
(such as hyaloclastite debris formed from the violent reaction of lava and water) between the pillows.
