What is shield volcano simple definition?
A shield volcano is a wide volcano with shallowly-sloping sides. Shield volcanoes are formed by lava flows of low viscosity – lava that flows easily. There are also shield volcanoes, for example, in Washington, Oregon, and the Galapagos Islands.
What is a shield type volcano?
A shield volcano is a type of volcano named for its low profile, resembling a warrior’s shield lying on the ground. It is formed by the eruption of highly fluid (low viscosity) lava, which travels farther and forms thinner flows than the more viscous lava erupted from a stratovolcano.
Why is it called a shield volcano?
Shield volcanoes are volcanoes that mainly erupt fluid (usually basaltic) lava flows that are able to travel over long distances and thus construct over time broad, gentle slopes. They are called shield volcanoes, because they resemble the shape of a warriors’ shield.
What are the characteristics of a shield volcano?
Shield volcanoes have the following characteristics:
- basic lava, which is non-acidic and very runny.
- gentle sides as the lava flows for long distances before it solidifies.
- no layers, as the volcano just consists of lava.
- less violent eruptions.
- shorter periods between eruptions.
What is the largest shield volcano on Earth?
These results show that Pūhāhonu is the largest shield volcano on Earth. It is twice the size of Mauna Loa volcano (148 ± 29 vs. ), which was assumed to be not only the largest Hawaiian volcano but also the largest known shield volcano on Earth.
Where are most shield volcanoes located?
The current largest and most famous shield volcanoes are located on the Hawaiian Islands. However, shield volcanoes are found all over the world. They formed the Galapagos Islands, and make up several of the volcanoes on Iceland. Apart from Hawaii, East Africa hosts several active shield volcanoes in the rift zone.
What is a famous shield volcano?
Examples of shield volcanoes are Kilauea and Mauna Loa (and their Hawaiian friends), Fernandina (and its Galápagos friends), Karthala, Erta Ale, Tolbachik, Masaya, and many others. Here are 4 of the volcanoes that comprise the big island of Hawai’i.
Are shield volcanoes dangerous?
The lava flow from a shield volcano eruption is largely composed from basaltic magma. The lava features a low viscosity and erupts in a relatively gentle stream. Therefore, shield volcano eruptions generally do not pose a threat to human lives, as the lava flow is easy to predict and avoid.
What is the shortest lived type of volcano?
Cinder cones form when thin or runny magma is flung in the air during an eruption, and then hardens and falls back to earth in fragments called “cinders.” Over time, these cinders build up, creating a cone shaped mound. Cinder cones can form rapidly, and are the shortest-lived volcanoes.
How do shield volcanoes get their shape?
Shield volcanoes, the third type of volcano, are built almost entirely of fluid lava flows. Flow after flow pours out in all directions from a central summit vent, or group of vents, building a broad, gently sloping cone of flat, domical shape, with a profile much like that of a warrior’s shield.
What are the 3 types of volcanoes?
- Composite, shield, cinder cones, and supervolcanoes are the main types of volcanoes.
- Composite volcanoes are tall, steep cones that produce explosive eruptions.
- Shield volcanoes form very large, gently sloped mounds from effusive eruptions.
Is Mount Etna a shield volcano?
Mount Etna consists of two edifices: an ancient shield volcano at its base, and the younger Mongibello stratovolcano, which was built on top of the shield. Etna’s current activity consists of continuous summit degassing, explosive Strombolian eruptions, and frequent basaltic lava flows.
Why do people live near volcanoes?
People live close to volcanoes because Geothermal energy can be harnessed by using the steam from underground which has been heated by the Earth’s magma. Apart from the volcano itself, hot springs and geysers can also bring in the tourists. This creates many jobs for people in the tourism industry.
What is the difference between a stratovolcano and a shield volcano?
Composite volcanoes, also known as stratovolcanoes, are towering structures, often rising more than 10,000 feet. Shield volcanoes are broad, typically 20 times wider than they are high. These volcanoes can be massive.
Are shield or composite volcanoes more dangerous?
Composite volcanoes are some of the most dangerous volcanoes on the planet. They tend to occur along oceanic-to-oceanic or oceanic-to-continental boundaries because of subduction zones. They tend to be made of felsic to intermediate rock and the viscosity of the lava means that eruptions tend to be explosive.