Table of Contents
- 1 Which of the following characteristic of magma affect the explosiveness of volcanic eruption?
- 2 Which of the following material from a volcano determines its explosiveness?
- 3 What determines how explosive an eruption is?
- 4 What are two important factors that affect the explosiveness of a volcanic eruption?
- 5 What are the factors that contribute to magma formation?
- 6 What makes magma explosive?
- 7 What makes a volcano explosive?
Which of the following characteristic of magma affect the explosiveness of volcanic eruption?
More crystals in the magma enable more gas bubbles to form, and so they make an eruption more explosive. The rate at which pressure is reduced also affects the explosiveness. If magma moves slowly toward the surface, gases in the magma have more time to escape.
Which of the following material from a volcano determines its explosiveness?
Explosive eruptions are favored by high gas content & high viscosity magmas (andesitic to rhyolitic magmas). The explosive bursting of bubbles fragments the magma into clots of liquid that cool as they fall through the air.
What is the major ingredients of magma?
The major ingredient in magma is silica (50- 70%), a compound made up of particles of the elements oxygen and silicon. The amount of silica in magma helps to determine its viscosity. The more silica magma contains, the higher its viscosity.
What determines how explosive an eruption is?
The amount of dissolved gas in the magma provides the driving force for explosive eruptions. The viscosity of the magma, however, is also an important factor in determining whether an eruption will be explosive or nonexplosive.
What are two important factors that affect the explosiveness of 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.
Which of the following characteristics of magma will form a shield volcano?
Shield volcanoes have the following characteristics: Basaltic magma, which is high in temperature, very low on silica and with low gas content. This type of magma produces fluid lava with very little explosive activity. Basic lava, which is non-acidic and very runny.
What are the factors that contribute to magma formation?
The factors that mainly affect in the formation of magma can be summarized into three: Temperature, Pressure and composition.
What makes magma explosive?
A volcano’s explosiveness depends on the composition of the magma (molten rock) and how readily gas can escape from it. As magma rises and pressure is released, gas bubbles (mainly of water vapor and carbon dioxide) form and expand rapidly, causing explosions.
Which characteristics correctly describe magma?
Magmas are mainly liquid and contain dissolved fluids such as water; most are less dense than the adjacent solid rock.