Composite Volcanoes Generally Consist Of What Materials?


Composite Volcanoes Generally Consist Of What Materials??

Some of the Earth’s grandest mountains are composite volcanoes–sometimes called stratovolcanoes. They are typically steep-sided symmetrical cones of large dimension built of alternating layers of lava flows volcanic ash cinders blocks and bombs and may rise as much as 8 000 feet above their bases.Jan 3 2011

What materials make up composite volcanoes?

Composite volcanoes—also called stratovolcanoes—are named for their composition. These volcanoes are built from layers or strata of pyroclastic material including lava pumice volcanic ash and tephra. The layers stack on each other with each eruption.

What materials make up composite volcanoes quizlet?

Composite volcanoes are made up of alternating layers of lava and ash (other volcanoes just consist of lava).

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.

What does a composite volcano eruption look like?

Composite volcanoes have steep slopes forming a basically symmetrical shape. The last eruption of the volcano may have even created a bowl a caldera at its peak making it appear as if the top of the mountain was sliced off or it may have collapsed from its own weight. Before Mount St.

Which of the following materials comprise a cinder cone quizlet?

Cinder cones are composed of generally felsic pyroclastic material and pumice.

What is the most common rock type of composite volcanoes quizlet?

The common rock type formed by the magma of composite volcanoes is andesite composed mostly of soda and lime-rich feldspar and ferromagnesian minerals with small amounts of quartz.

What are the three categories of materials extruded in a volcanic eruption?

Volcanic eruptions produce three types of materials: gas lava and fragmented debris called tephra.

What is the characteristics of composite volcano?

The characteristics of composite volcanoes also known as stratovolcanoes are: cone shape with steep sides. made of layers of hardened cinder lava and ash. most violent eruptions of all volcano types.

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What do composite volcanoes and shield volcanoes have in common?

Shield volcanoes erupt quietly. … Explosive stratovolcanoes or composite volcanoes have steep symmetrical conical shapes built up over time by alternating layers of lava flows volcanic ash cinders and other volcanic particles. A central vent or cluster of vents is at the summit.

Why are composite volcanoes so explosive?

Composite volcanoes are made of felsic to intermediate rock. The viscosity of the lava means that eruptions at these volcanoes are often explosive (Figure below). … The viscous lava cannot travel far down the sides of the volcano before it solidifies which creates the steep slopes of a composite volcano.

What do composite volcanoes do?

Composite cones are tall cone shaped volcanoes that produce explosive eruptions. Shield volcanoes form very large gently sloped volcanoes with a wide base. Cinder cones are the smallest volcanic landform. They are formed from accumulation of many small fragments of ejected material.

Which of the following materials comprise a cinder cone?

Cinder cones are small volume cones consisting predominantly of ash and scoria that result from mildly explosive eruptions. They usually consist of basaltic to andesitic material. They are actually fall deposits that are built surrounding the eruptive vent.

Which gas is most abundantly emitted by volcanic activity?

By far the most abundant volcanic gas is water vapor which is harmless. However significant amounts of carbon dioxide sulfur dioxide hydrogen sulfide and hydrogen halides can also be emitted from volcanoes.

How does the composition and viscosity of lava flows differ between composite volcanoes and shield volcanoes?

How does the composition and viscosity of lava flows differ between composite volcanoes and shield volcanoes? Composite volcanoes tend to have intermediate to felsic lava that is very viscous whereas shield volcanoes have basaltic lava that is low in viscosity.

What igneous rock type is most likely associated with a composite volcano?

The dominant rock constituting the composite volcanoes is andesite but in some younger island arcs basalt tends to be more common and in older volcanic areas dacite or rhyolite becomes prominent. Two different series of rocks are found in some volcanic chains.

How does the composition of a typical lava dome differ from that of a typical fissure eruption?

How does the composition of a typical lava dome differ from that of a typical fissure eruption? a lava dome’s flow is silica-rich and has a high viscosity whereas a fissure eruption is basaltic and has a low viscosity.

What type of mineral composition is most commonly associated with shield volcanoes?


Shield volcanoes are the largest volcanoes on Earth that actually look like volcanoes (i.e. not counting flood basalt flows). The Hawaiian shield volcanoes are the most famous examples. Shield volcanoes are almost exclusively basalt a type of lava that is very fluid when erupted.

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What is a composite volcano example?

Examples of composite volcanoes include Mount St. Helens Mount Rainer Mount Shasta Mount Hood and Mount Pinatubo. Sometimes composite volcanoes and other violent volcanoes can erupt so violently that they sometimes collapse in on themselves or actually blow themselves up to produce calderas.

What are the components of a volcano?

The three main parts of a volcano are the chamber the vent and the crater.

What are the products of volcanic eruption?

Main products of volcanic eruptions are hot molten rocks known as lava volcanic gases like sulphur dioxide steam smoke and ash.

What are the characteristics of composite materials?

However as a class of materials composites tend to have the following characteristics: high strength high modulus low density excellent resistance to fatigue creep creep rupture corrosion and wear and low coefficient of ther- mal expansion (CTE).

How composite volcanoes are formed?

Composite cone volcanoes are also called stratovolcanoes. They form when different types of eruptions deposit different materials around the sides of a volcano. Alternating eruptions of volcanic ash and lava cause layers to form. Over time these layers build up.

What type of material makes up volcanoes with broad sloping sides?

Question Answer
What type of material makes up volcanoes with borad sloping sides? lava
What type of volcano is made of lava volcanic ash and cinders? composite
A broad volcano with gently sloping sides? Shield
Bits of rock or solidified lava dropped from the air? Tephra

Which of the following materials from a volcano determines its explosiveness?

The amount of dissolved gas in the magma provides the driving force for explosive eruptions. The viscosity of the magma however is also an important factor in determining whether an eruption will be explosive or nonexplosive.

Where are composite volcanoes found?

Composite volcanoes are found on destructive plate margins where the oceanic crust sinks beneath the continental crust. Composite volcanoes have the following characteristics: Acidic lava which is very viscous (sticky). Steep sides as the lava doesn’t flow very far before it solidifies.

Was Mount Everest a volcano?

Just to put you at ease Everest is not a volcano and will never erupt. Sherpas and climbers will stay in business for a long time. Yet there are a number of super volcanoes on earth building pressure. These eruptions are extremely rare as pressure building isn’t always what triggers a volcano event.

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Are composite volcanoes active?

Helens Mount Pinatubo and Krakatoa are just examples of composite volcanoes that have erupted. Famous landmarks like Mount Fuji in Japan Mount Ranier in Washington State and Mount Kilimanjaro in Africa are composite volcanoes that just haven’t erupted recently.

What is the shape of composite volcanoes?

conical shape
Unlike shield volcanoes composite volcanoes have a distinctly conical shape with sides that steepen toward the summit. Cinder cones are the smallest and almost too small to see next to a volcano like Mauna Loa. Eve Cone is a cinder cone on the flanks of Mt.

Which of the following is a composite type of volcano answer?

These volcanoes are built up of many layers of hardened lava tephra pumice ash. A Composite volcano is also called a stratovolcano.

Are composite volcanoes explosive or effusive?

Composite volcanoes are tall steep cones that produce explosive eruptions. Shield volcanoes form very large gently sloped mounds from effusive eruptions.

What is pyroclastic material made of?

Pyroclastic flows contain a high-density mix of hot lava blocks pumice ash and volcanic gas. They move at very high speed down volcanic slopes typically following valleys.

Why are landslides common on volcanic cones?

Landslides are common on volcanic cones because they are tall steep and weakened by the rise and eruption of molten rock. Magma releases volcanic gases that partially dissolve in groundwater resulting in a hot acidic hydrothermal system that weakens rock by altering minerals to clay.

What volcanic material is responsible for the soil fertility after eruption?

Tephra (the scientific name of volcanic ash) contains primary minerals which have abundance of nutrients. Over time chemical and biological weathering the ashes will release the nutrients and the ash will increase its surface area enable them to hold more nutrients and water.

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