What will most likely occur during a volcanic eruption if the magma that forms the volcano has a high viscosity?(1 point)
Responses
The magma will be ejected slowly, forming a volcano with gentle slopes.
The magma will be ejected slowly, forming a steep-sided volcano.
The magma will erupt violently, forming a volcano with gentle slopes.
The magma will erupt violently, forming a steep-sided volcano.
The magma will erupt violently, forming a steep-sided volcano.
Which statement correctly describes most cinder cone volcanoes?(1 point)
Responses
They emit lava that slowly spreads before cooling.
They often take thousands of years to form.
They are one of the tallest types of volcanoes.
They have a single, symmetrical cone at the top.
They have a single, symmetrical cone at the top.
Which of these are features of most stratovolcanoes?(1 point)
Responses
steep sides near the top with thick, slow-moving lava
gentle slope near the top with thin, quickly flowing lava
gentle slope near the base with somewhat quiet eruptions
steep sides near the base with sudden, violent eruptions
steep sides near the base with sudden, violent eruptions
To answer this question, we need to understand the relationship between magma viscosity and volcanic eruptions. Magma viscosity refers to how resistant the magma is to flow. Magma with high viscosity is thick and sticky, while magma with low viscosity is thin and runny.
When magma with high viscosity erupts, it tends to trap gases within it, leading to an increase in pressure. This pressure buildup can result in a more explosive eruption. The high viscosity makes it more difficult for the trapped gases to escape, leading to a violent release of gas and volcanic material.
In the given options, the most fitting response would be "The magma will erupt violently, forming a steep-sided volcano." This is because high viscosity magma tends to erupt violently due to the trapped gases, resulting in explosive eruptions. These explosive eruptions typically form steep-sided volcanoes, also known as stratovolcanoes, due to the accumulating layers of ash, lava, and volcanic rocks.
So, in summary, if the magma that forms the volcano has high viscosity, it will most likely erupt violently, forming a steep-sided volcano.