What Type Of Lava Is Produced At A Divergent Plate Boundary

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What Type Of Lava Is Produced At A Divergent Plate Boundary?

Shield volcanoes are found on divergent plate boundaries where two plates move away from one another. Shield volcanoes have the following characteristics: Basaltic magma which is high in temperature very low on silica and with low gas content.Shield volcanoes

Shield volcanoes
The chain includes Mauna Loa a shield volcano which stands 4 170 m (13 680 ft) above sea level and reaches a further 13 km (8 mi) below the waterline and into the crust approximately 80 000 km3 (19 000 cu mi) of rock.

What type of magma is found at divergent boundaries?

basaltic
plate movements plates move apart at a divergent plate boundary the release of pressure produces partial melting of the underlying mantle. This molten material known as magma is basaltic in composition and is buoyant. As a result it wells up from below and cools close to the surface to generate new crust.…

What type of lava most commonly erupts at divergent plate boundaries?

Shield volcanoes are produced at divergent plate boundaries and intraplate. Cinder cones are made of small fragments of a variety of compositions usually from a single eruption. They are found with composite and shield volcanoes.

What is formed at the divergent plate boundary?

A divergent plate boundary often forms a mountain chain known as a ridge. This feature forms as magma escapes into the space between the spreading tectonic plates.

Is a divergent boundary likely to produce rhyolitic lava?

Is a divergent boundary likely to produce rhyolitic lava? No. Rhyolitic lava forms when magma melts through continental crust that is high in aluminosilicate rocks however most volcanism along divergent boundaries occurs in the ocean.

What produces magma in a divergent plate setting?

At divergent plate boundaries two plates are moving away from each other. … Introduction of water into the mantle by the subducting plate causes melting in the upper mantle producing magmas that are richer in silica and more like the continental crust than they are the mantle or the subducting plate.

What type of magma makes a composite volcano?

Composite volcanoes have the following characteristics: Andesitic magma which is lower in temperature has more silica and a lot of dissolved gases and is more likely to explode when it reaches the surface. Acidic lava which is very viscous (sticky). Steep sides as the lava doesn’t flow very far before it solidifies.

How is magma generated at divergent boundaries quizlet?

Divergent boundaries-(Decreased Pressure)volcanic activity occur where the plates pull apart. Mantle rock rises and fills gaps between plates. As rock rises decompression melting occurs (less pressure/lower temp to melt). … Magma forms slowly and migrates upward forming volcanoes.

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.

What kind of lava is found in a dome volcano?

The rock types that form lava domes are generally andesites dacites or rhyolites. Somehow these viscous lavas have lost much of their gas content in prior eruptions or during a slow rise to the surface.

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What causes volcanoes to form at a divergent plate boundary?

What causes volcanoes to form at a divergent plate boundary? The divergent boundaries pull apart from each other creating a weak spot in the crust allowing magma o come through and reach the surface. … A volcano forms above a hot spot when magma erupts through the crust and reaches the surface.

Which two formations are caused by divergent plates?

Valleys and oceanic ridges are formed at divergent plate boundaries.

What happens at a divergent boundary?

Divergent boundaries occur along spreading centers where plates are moving apart and new crust is created by magma pushing up from the mantle. Picture two giant conveyor belts facing each other but slowly moving in opposite directions as they transport newly formed oceanic crust away from the ridge crest.

What geologic features events may occur at divergent plate boundaries?

Effects that are found at a divergent boundary between oceanic plates include: a submarine mountain range such as the Mid-Atlantic Ridge volcanic activity in the form of fissure eruptions shallow earthquake activity creation of new seafloor and a widening ocean basin.

Why is magma at divergent plate boundaries mafic in composition whereas magma at convergent plate boundaries is intermediate or felsic in composition?

At divergent boundaries magma forms because of decompression melting. … The initial magmas in most volcanic regions are mafic in composition but they can evolve into more felsic types through interaction with crustal rock and as a result of crystal settling within a magma chamber.

Which type of plate boundary generates the greatest quantity of magma?

The greatest volume of magma is produced along the oceanic ridge system in association with seafloor spreading.

What topographic feature is formed in the divergent boundary?

Most divergent plate boundaries are underwater and form submarine mountain ranges called oceanic spreading ridges. While the process of forming these mountain ranges is volcanic volcanoes and earthquakes along oceanic spreading ridges are not as violent as they are at convergent plate boundaries.

What happens to magma at divergent boundaries?

What happens to magma at divergent boundaries? it rises to the surface and cools to form new ocean lithosphere. … Fluids are released from the subducted plate causes mantle rock to melt and form magma.

What happens at convergent and divergent plate boundaries?

A divergent boundary occurs when two tectonic plates move away from each other. … At convergent plate boundaries oceanic crust is often forced down into the mantle where it begins to melt. Magma rises into and through the other plate solidifying into granite the rock that makes up the continents.

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Why is magma at divergent plate boundaries mafic in composition?

At divergent boundaries magma forms because of decompression melting. … The initial magmas in most volcanic regions are mafic in composition but they can evolve into more felsic types through interaction with crustal rock and as a result of crystal settling within a magma chamber.

How is magma generated along convergent plate boundaries to produce the major composite volcanoes of the ring of fire?

Helens are in this ring. How is magma generated along convergent plate boundaries? As old oceanic crust is subducted it descends into the lower crust and mantle. This process destroys the old crust which melts and generates magma beneath the surface.

What kind of lava is a composite volcano most likely to be associated with?

Composite volcanoes are built by multiple eruptions sometimes recurring over hundreds of thousands of years sometimes over a few hundred. Andesite magma the most common but not the only magma type tends to form composite cones.

How is magma generated in convergent boundary?

How is magma generated along convergent plate boundaries? Friction from the subducting plate raises the temperature of the rock under which it subducts melting this rock into magma. The subducting plate pushes mantle rock upwards where it reaches the surface through the trench.

When contrasting lava from a composite volcano to lava from a shield volcano?

When contrasting lava from composite volcanoes to lava from shield volcanoes composite volcanoes most often produce silica-rich lavas with high viscosities whereas shield volcanoes produce basaltic lavas with low viscosities.

What type of volcano is found along a convergent boundary quizlet?

While there are several different types of volcanoes depending on the tectonic environment the type most common at convergent plate boundaries is shown here. This is called a stratovolcano (also called a composite volcano).

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.

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What types of lava flows are there?

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.

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.

Where are lava dome volcanoes commonly found?

Lava domes can form anywhere associated with volcanic activity. They are commonly found within the crater of large composite volcanoes such as Mount St. Helens but are not limited to this location. They also often occur on the flanks of volcanoes.

Which type of volcano has a dome shape?

Lava domes

Schematic representation of the internal structure of a typical volcanic dome. Volcanic or lava domes are formed by relatively small bulbous masses of lava too viscous to flow any great distance consequently on extrusion the lava piles over and around its vent.

What type of magma erupts out of dome complexes?

Felsic magma is the answer.

Where does the lava from volcanoes come from?

Lava (which as you undoubtedly know is partially molten rock erupted by volcanoes) typically comes from the mantle—the Earth’s middle layer sandwiched between the crust and the core. Once it reaches the surface lava quickly cools down and solidifies completely creating new land.

How do volcanoes form at B?

Volcanoes form at B when the oceanic plate is subducted and the plate melts and forms magma. This magma rises towards the surface and erupts as lava which forms the volcanoes. … Magma melts through the crust and moves to the surface in a hot spot. Also a collision between two oceanic plates can form volcanoes.

Do divergent plate boundaries create volcanoes?

Volcanoes are most common in these geologically active boundaries. The two types of plate boundaries that are most likely to produce volcanic activity are divergent plate boundaries and convergent plate boundaries. At a divergent boundary tectonic plates move apart from one another.

Explanation of divergent plate boundaries and shield volcano’s

Two types of Divergent Plate Boundaries

Plate Boundaries-Divergent-Convergent-Transform

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