What are the three types of volcanoes?

What are the three types of volcanoes?

Volcanoes are classified into three types: cinder cones (also known as "spatter cones"), composite volcanoes (also known as "stratovolcanoes"), and shield volcanoes. Figure 11.22 depicts the variations in size and shape between these volcanoes. The largest are shield volcanoes, so named because of their wide, rounded form. They can be either flat-topped or gently sloping. The most active volcanoes are also usually the highest, with steep slopes covered in volcanic material. Composite volcanoes have two or more distinct peaks that reach the same elevation as a single peak of a shield volcano. They are formed when an elongated plug of molten rock called a lava dome builds up inside a void left by a previous eruption. As the dome grows it forces its way to the surface, building up the surrounding rock as it goes, until it reaches enough height to force its way out through the roof of the void it has created. Once the dome has burst through, the pressure inside the chamber decreases, causing another explosion of lava from the top of the dome. This leads to more explosive eruptions as well as regular smaller amounts of lava being pumped out over time.

Cinder cones are similar to composite volcanoes except that they do not have a central vent like the dome that forms the heart of a lava dome. Instead, the heat from within the cone causes the rock to melt, drizzle down the sides in a thin layer of glassy pumice, and then harden again into stone as it hits the ground.

What are the three general groups of volcanic activity throughout the world?

Volcanoes are classified into three types: cinder cones, composite cones, and shield cones. Cinder cones are high, isolated objects composed of fine particles of rock (volcanic cinders) mixed with sand or clay. They often have a single peak but can have several peaks. Cinder cones are usually less than 200 meters (660 feet) tall. Composite cones are similar to cinder cones but they have two or more peaks. They can be as high as 600 meters (1,970 feet). Shield cones are large, flat-topped mounds formed by the erosion of a volcano's cone or craters. They can reach heights of over 1000 meters (3,280 feet). The largest known shield volcano is Mauna Kea on Hawaii Island. It is nearly 4 kilometers (2.5 miles) around its base and 467 meters (1550 feet) high.

Cinder cones and composite cones sometimes emit lava flows that erode away leaving smooth, flat surfaces known as palisades. These may be the only remains of a volcano after an eruption. Palisades often border lakes or other bodies of water where they form partial or complete barriers between land and sea.

What are the different types of cinder cone volcanoes?

Combined Volcanoes of Cinder Cone 1 Stratovolcanoes are another name for composite volcanoes. There are two shield volcanoes. Shield volcanoes are generated by lava layers. There are three lava volcanoes. These volcanoes are smaller in size and are made up of viscous lava. There are four Cinder Cones....

What are the three ways to describe a volcano?

Volcanoes are classified into three types: composite or stratovolcanoes, shield volcanoes, and dome volcanoes. Composite volcanoes, also known as stratovolcanoes, are steep-sided cones created by ash and [lava] flows. These volcanoes' eruptions might be pyroclastic flows rather than lava flows. Shield volcanoes have relatively flat tops and usually occur on islands. They form when the weight of ice on top of an underground chamber causes the roof to collapse, forming a crater. Dome volcanoes have a raised central part called a domes whose origin is similar to that of a shield volcano but without the weight of ice above them. Domes can reach heights of more than 3,000 feet (900 m) but most are much lower.

Stratovolcanoes are still active volcanoes that show all the signs of activity: frequent earthquakes, gas emissions, and surface explosions (called "bombs"). But they do not have a solid crust like a shield or a dome volcano. Instead, their weight causes the earth's crust to stretch like rubber, which in turn forces molten rock up from deep within the planet to fill the void left by the disappearing ice. The liquid rock then cools and hardens into stone, causing the volcano to rise even higher.

Shield volcanoes can be very large, such as Mauna Kea on Hawaii, but most are small. Only about one in ten volcanoes is a shield. The rest are either composite or dome volcanoes.

What type of volcano is flatter and dome-shaped?

Shield volcanoes are massive, gently sloping volcanoes made of relatively thin lava that spreads out from a primary vent in all directions. They feature several-mile-wide bases with steeper intermediate slopes and a flatter peak. They have the form of a medieval knight's shield due to the smooth convex slopes. Shield volcanoes can be either solitary or clustered. Clustered shield volcanoes are found in groups of two or more and often rise up near each other before spreading out at different distances from their common center.

The largest shield volcano on Earth is also located in Japan: Mount Fuji. Other large shield volcanoes include Mauna Kea (Hawaii), Nevado de Toluca (Mexico), Pavlof (USA), and St. Helens (Washington).

Shield volcanoes are usually less than 10 kilometers (6 miles) tall but some reach 30 kilometers (19 miles). They tend to be much flatter at the top than conventional volcanoes and have very little structural strength because the weight of the overlying rock layer is supported only by the thinner layer of lava below it. As a result, they can sometimes collapse entirely, forming a new volcanic island from their base.

Shield volcanoes form when molten rock pushes its way up through the crust, replacing the old rock with fresh lava. The heat from the molten rock causes the surrounding rock to melt as well, creating a kind of hot bath for the shield volcano to grow in.

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Marian Hargrove

Marian Hargrove is a teacher who has been in the education field for over 10 years. Marian is passionate about helping her students reach their full potential and strives to make learning fun and interesting for all of her pupils. She graduated from the University of New Mexico with a Bachelor's degree in Elementary Education.

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