Which volcanic landform is created by the collapse of the summit of a volcano?
Depressions such as Crater Lake, formed by collapse of volcanoes, are known as calderas. They are usually large, steep-walled, basin-shaped depressions formed by the collapse of a large area over, and around, a volcanic vent or vents.
Which of the following is a characteristic of a continental volcanic arc along an oceanic continental subduction zone such as the western margin of South America?
Which of the following are characteristic of a continental volcanic arc along an oceanic–continental subduction zone, such as the western margin of South America? An explosive eruption.
What is the name of a volcanic hazard composed of hot gases and lapilli that runs downhill at tremendous speed perhaps 100 mph )?
What is the name of a volcanic hazard composed of hot gases and lapilli that runs downhill at tremendous speed (perhaps > 100 mph!)?
What factors determine the type of volcanic eruption?
The style of eruption depends on a number of factors, including the magma chemistry and content, temperature, viscosity (how runny the magma is), volume and how much water and gas is in it, the presence of groundwater, and the plumbing of the volcano.
Is Taal Volcano a shield volcano?
The shield cone looks like an inverted semi-sphere. This type of volcano does not burst out violently. One example of that is Taal Volcano, a small volcano located in an island at Batangas, Philippines.
What are the three types of volcano?
- 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.
Which kind of eruptive activity is highly explosive?
geo quiz 6
|Spreading center volcanism most generally produces rocks that are ________.||basaltic in composition|
|Which kind of eruptive activity is most likely to be highly explosive?||eruptions of big, continental margin, composite cones or stratovolcanoes|
What are the two primary factors that determine how magma erupts?
The two main factors that influence how a volcano will erupt are viscosity and gas content. Both are related to the composition of the magma.
What is the relationship between the crust and the lithosphere?
The crust is dragged by the hot plastic fluid in the uppermost mantle, and the lithosphere is formed as only a weak interface between the lower crust and upper mantle lid above the asthenosphere in seismic earth models.
What is the most dangerous type of volcanic hazard?
Lava-flows, together with gas exhalations, mud pools, hot springs and rock avalanches, have an intermediate range, being most lethal in the surrounding of the volcano. Tephra fall can be dangerous, especially for persons with respiratory problems, over a distance of 270 miles (170km).
What is the most explosive type of volcano?
Because they form in a system of underground conduits, stratovolcanoes may blow out the sides of the cone as well as the summit crater. Stratovolcanoes are considered the most violent. Mount St. Helens, in Washington state, is a stratovolcano that erupted on May 18, 1980.
What is the difference between magma and lava?
Scientists use the term magma for molten rock that is underground and lava for molten rock that breaks through the Earth’s surface.
What are the different volcanic hazards?
What are the hazards from volcanoes?
- Lava. Lava (molten rock) can erupt as fire fountains or lava flows (when it is runny) or as steep-sided domes (when it is viscous).
- Pyroclastic flows.
- Phreatic explosions.
- Volcanic earthquakes.
What are the 3 factors that affect a volcanic eruption?
Although there are several factors triggering a volcanic eruption, three predominate: the buoyancy of the magma, the pressure from the exsolved gases in the magma and the injection of a new batch of magma into an already filled magma chamber.
What are the three main factors that determine the shape of a volcano?
- The volume of volcanic products.
- The interval length between eruptions.
- The composition of volcanic products.
- The variety of volcanic eruption types.
- The geometry of the vent.
- The environment into which the volcanic products are erupted.