what are the names of the two types of lava flows?

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What Are The Names Of 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.

What are the types of lava flow?

What Types of Lava Flows Are There on Land? On land, there are two basic types of lava: a’a (pronounced ah-ah) and pahoehoe(pronounced pah-hoy-hoy). Polynesians use these words to describe a smooth, rollingsea (pahoehoe) or a rough, choppy ocean (a’a).

What is the difference between aa and pahoehoe lava flows?

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.

How many lava flows are there?

Volcano World

There are three types of basalt lava flows: pillow, pahoehoe, and a’a.

Why are there two types of lava?

And so, there are several different types of lava. The type of lava coming out of a volcano depends on its mineral content. Some lava is very thin, and can flow out of a volcano in great rivers that go for dozens of kilometers. Other lava is very thick, and only flows for a short distance before cooling and hardening.

What are the names of the two types of lava flows quizlet?

Terms in this set (6)
  • Pahoehoe. -Basaltic Lava. -The 2nd most abundant type of lava. …
  • Pillow. -Basaltic lava(Most abundant basaltic lava) -Volumetrically the most abundant type. …
  • A’a. -Basaltic lava. -Rough, jagged surface. …
  • Cinders. -Lava cools and solidifies in the air. …
  • Block Lava. -Basaltic lava. …
  • Rhyolite Lava. -Varied textures.

What are the 3 main types of lava?

The high temperatures and pressure under Earth’s crust keep magma in its fluid state. There are three basic types of magma: basaltic, andesitic, and rhyolitic, each of which has a different mineral composition.

What are the two types of lava produced from Kilauea and how are they different?

What are the differences between Pāhoehoe and ʻAʻā lava? The most obvious difference between the two is that pāhoehoe flows are smooth, and aʻā are not. Furthermore, aʻā flows consist of only 1-2 large flow units, while pāhoehoe flows consist of thousands and thousands of small flow units called toes.

What are the three main types of lava and how are they different?

The most common way to divide lava flows into distinct types is following: Pahoehoe lava flow, Aa lava flow, Blocky lava flow, and also Pillow lava flow.

Types of Lava Flows
  • Red hot basaltic lava flow. Hawaii.
  • Blocky lava. …
  • Slowly solidifying pahoehoe lava flow. …
  • Pillow lava. …
  • Transition from smooth pahoehoe to rubbly aa.

What is a pillow of lava?

Pillow lavas are bulbous, spherical, or tubular lobes of lava. They form during eruptions with relatively low effusion rates. … Pillows often have lineations or scrape marks on their sides that form during extrusion. Pillow flows are produced by the piling up of individual pillow lava lobes.

What are the two types of basaltic lava flows?

Basaltic lava generally takes two distinct forms known by the Hawaiian terms pahoehoe and aa. Pahoehoe has a smooth wavy surface that resembles twisted rope. It advances by extruding molten toes of lava beneath a thin, flexible crust. As it travels pahoehoe lava often changes to blocky flows called aa.

What types of volcanoes is andesitic lava found in?

Andesite commonly erupts from stratovolcanoes, where they form small-volume flows that typically advance only short distances down the flanks of a volcano. The two examples shown here are short andesite flows advancing down the slope of the Lascar volcano in Chile, and the Colima volcano in Mexico.

What are the different types of volcanoes according to their activity?

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 are the two types of lava in Hawaii?

There are two principal types of lava flows in Hawaii. Pahoehoe is the type characterized by smooth, ropy, or billowy surfaces (Plate 5); whereas aa has a very rough, spiny or rubbly surface, but a massive interior (Plate 4).

What are volcanic flows called?

Lava
Lava may be erupted at a volcano or through a fracture in the crust, on land or undersea, usually at temperatures from 800 to 1,200 °C (1,470 to 2,190 °F). The volcanic rock resulting from subsequent cooling is also often called lava. A lava flow is an outpouring of lava during an effusive eruption.

What is a lava flow called?

‘A’a lava flows are also called clinkers, because of their rough and jagged appearance. The eruptions of submarine volcanoes result in pillow lavas, which form as the lava cools in seawater.

Which type of lava flows easily quizlet?

Pahoehoe lava is smoother and flows faster than Aa lava.

What are the two primary factors that determine how magma erupts quizlet?

The two primary factors that determine how magma erupts is its viscosity and gas content.

What are the two primary factors that determine the nature of a volcanic eruption?

what are the primary factors that determine the nature of volcanic eruptions? The magma’s composition, it’s temperature and the amount of dissolved gases it contains.

What are the 3 types of volcanoes?

Individual volcanoes vary in the volcanic materials they produce, and this affects the size, shape, and structure of the volcano. There are three types of volcanoes: cinder cones (also called spatter cones), composite volcanoes (also called stratovolcanoes), and shield volcanoes.

What type of lava flows the fastest?

Basaltic lava flows
Basaltic lava flows move much faster than rhyolitic lava flows. Also, the amount of gas dissolved in the lava can change the flows ability to flow (viscosity). The rate of material that the vent is spewing out. During some eruptions vast amounts of lava are released and so the flows tend to be faster.

What is fast moving lava called?

lava, magma (molten rock) emerging as a liquid onto Earth’s surface. … Lava flowing toward the sea from Kilauea volcano, Hawaii, takes two recognizable forms: fast-flowing, ropy lava, called pahoehoe, and thick, blocky lava, called aa.

What kind of volcano is Haleakala?

shield volcano
HALEAKALA VOLCANO Haleakala (the house of the sun) is the big volcanic mountain that forms the eastern part of the island of Maui. It started its growth as a typical shield volcano like Kilauea and Mauna Loa.

What type of lava does Kilauea have?

basalt
Kilauea is a basaltic shield volcano, erupting a type of basalt known as tholeiite. This type of lava is the dominant extrusive during the shield building (the main stage) of hawaiian volcanism and is the dominant basalt type erupted on Earth.

What type of volcano is Mt St Helens?

stratovolcano
Mount St. Helens is a stratovolcano, a steep-sided volcano located in the Pacific Northwest region of the United States in the state of Washington. Sitting about 97 miles south of Seattle and 52 miles northeast of Portland, Oregon, Mt.

What are the different types of eruption?

Types of eruptions
  • Hydrothermal eruption. An eruption driven by the heat in a hydrothermal systems. …
  • Phreatic eruption. An eruption driven by the heat from magma interacting with water. …
  • Phreatomagmatic eruption. …
  • Lava. …
  • Strombolian and Hawaiian eruptions. …
  • Vulcanian eruptions. …
  • Subplinian and Plinian eruptions.

What is the most common type of magma?

Viscosity of Magmas
Summary Table
Magma TypeSolidified RockTemperature
BasalticBasalt1000 – 1200 oC
AndesiticAndesite800 – 1000 oC
RhyoliticRhyolite650 – 800 oC

Does Obsidian exist?

obsidian, igneous rock occurring as a natural glass formed by the rapid cooling of viscous lava from volcanoes. Obsidian is extremely rich in silica (about 65 to 80 percent), is low in water, and has a chemical composition similar to rhyolite.

Is the Hawaiian hotspot still active?

The Hawai’i hotspot is a volcanic hotspot located near the namesake Hawaiian Islands, in the northern Pacific Ocean. Four of these volcanoes are active, two are dormant; more than 123 are extinct, most now preserved as atolls or seamounts. …

What is blocky lava flow?

A surface flow of hot, molten lava covered in a carapace of crystalline, angular blocks which tend to be smoothly faceted and may have dimensions up to several metres. … Blocky lava morphology is usually confined to lavas of high viscosity and intermediate to high silica contents.

What is the difference between andesitic and basaltic lava?

Both lavas are formed at different plate boundaries which is why they have different silica contents: the basaltic lava forms from the hot mantle material at constructive plate boundaries and hotspots whereas the andesitic lava forms at destructive plate boundaries from melting crust.

What is basaltic lava called?

Basaltic lava, or mafic lava, is molten rock enriched in iron and magnesium and depleted in silica. … When on land, basaltic lavas are commonly seen as pahoehoe or ‘a’a flows. Underwater, basaltic lavas are erupted as pillow basalts. More rare basaltic lava features include lava lakes and lava fountains.

What is andesitic lava flows?

lava. In lava. Lavas of andesitic or intermediate composition commonly form a somewhat different type of flow, known as a block lava flow. These resemble aa in having tops consisting largely of loose rubble, but the fragments are more regular in shape, most of them polygons with fairly smooth sides.…

Which magma type produces the most lava flows?

fallout of volcanic blocks the size of automobiles. glowing avalanches of volcanic rock fragments. Which magma type produces the most lava flows? Rhyolitic.

Silica Content & Types of Lava Flows

Types of Lava and Lava Flow

Types of Lava Flows

Lava flows: What to know about a’a and pahoehoe

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