What kind of volcano is a stratovolcano?
A stratovolcano is a volcano that has been built up by the layering of other materials. Kilimanjaro, a dormant stratovolcano, is the highest mountain in Africa. A stratovolcano is a tall volcano shaped like a cone, formed by various layers of materials such as volcanic ash, hardened lava, pumice, and tephra.
What makes up the cone of a stratovolcano?
At the peak, stratovolcanoes usually have a small crater. Stratovolcanoes build up on height by layering lava, ash and tephra. By definition, they have alternating layers of pyroclastics and lava. When ash falls or lava flows, it solidifies and makes a narrower cone. Lava is high viscosity so it’s steep sided.
How does a stratovolcano build up on its peak?
At the peak, stratovolcanoes usually have a small crater. Stratovolcanoes build up on height by layering lava, ash and tephra. By definition, they have alternating layers of pyroclastics and lava.
Where does a stratovolcano occur in the subduction zone?
Stratovolcanoes occur mostly in subduction zones, where the oceanic crust slides under continental crust. The descent of the oceanic plate causes the release of trapped water from hydrated minerals and porous rock, into the mantle rock in the area above the oceanic slab. This process occurs at different pressures depending on the minerals.
How does a stratovolcanoe build up on height?
Stratovolcanoes build up on height by layering lava, ash and tephra. By definition, they have alternating layers of pyroclastics and lava. When ash falls or lava flows, it solidifies and makes a narrower cone. Lava is high viscosity so it’s steep-sided.
What is the speed of lava in a stratovolcano?
This type of flow can travel at speeds up to 700 mph. But stratovolcanoes run through cycles with lots of small eruptions. Even though the conduit is the main pipe from the magma chamber to the summit, lava can also go through a dyke or fissure to a side vent.
What kind of material is ejected from a stratovolcano?
Tephra is volcanic material ejected from a volcano, and a hardened deposit of tephra is called a tuff. Stratovolcanoes form through explosive eruptions depositing material near a central vent. The most common eruption types at stratovolcanoes are Strombolian, Vulcanian, and Plinian eruptions.
What kind of damage does a stratovolcano do?
These bombs travel at high speeds and may damage buildings or harm people even as far as 12 miles away. Stratovolcanoes produce highly viscous lava that flows slowly and may not endanger human and animal life since they have a chance to flee. This lava may damage property.
What makes a stratovolcano look like a cone?
A stratovolcano is a tall volcano shaped like a cone, formed by various layers of materials such as volcanic ash, hardened lava, pumice, and tephra.
Why are stratovolcanoes found in Asia and Alaska?
The stratovolcanoes along Asia and Alaska are due to the subduction of the Pacific plate. The stratovolcanoes along the Americas are due to the subduction of smaller tectonic plates. An error occurred trying to load this video. Try refreshing the page, or contact customer support. Are you a student or a teacher?
Are there any stratovolcanoes in the North America?
In Africa, there is Mount Kenya in Kenya, the dormant Mount Kilimanjaro in Tanzania, and Alid Volcano in Eritrea. Stratovolcanoes in North America include Hoodoo Mountain, Nevado de Toluca, Frosty Peak Volcano, and Mount Taylor.