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More than anything else, it's water. The caldera is a natural rain-catcher, and cracks in surface rocks fill when it rains, and percolates down to deeper cracks. The pressure of the overlaying rock keeps the water from expanding into steam even at temperatures much higher than 100 degrees C = 212 degrees F. When underlaying magma starts pushing upward, sometimes in conjunction with a quake that 'crumbles' the overlaying rock, the water then 'flashes' into steam and takes only a few seconds to blow loose material out of the caldera. As the magma wells up and emerges, becoming lava, it too no longer has the weight of the volcano pressing it down so any gases it contains would expand and cause more explosions.
What else can I help you with?
What is the strongest factor that controls the development of soils?
Climate is the strongest factor that controls the development of soils, as temperature and precipitation influence factors such as weathering rates, organic matter decomposition, and vegetation growth, which in turn shape the characteristics of soils.
Is gasoline more explosive than gas?
In general gasoline is not more explosive then gas although it depends on the conditions and the gas. Probably you are referring to natural gas, the gas piped into homes which is predominantly methane. In general flammable gasses are more explosive than flammable liquids because they are mixed up with atmospheric oxygen. This is why modern cars have fuel injection which sprays the petrol to make it more easily combustible. In fact liquid petrol is not explosive at all but because it is volatile a layer of vapour forms above the surface of the liquid which is explosive. The mix of fuel and oxygen is the critical factor in whether something is explosive. Some gases, such as the noble gases are not flammable at all.
What is a factor that controls grain size in igneous rock?
It depends on if it is intrusive or extrusive. If it is an intrusive rock, it is formed when magma hardens under the earth and has a larger grain size. If it is an extrusive rock, it is formed when lava hardens on the earth's surface and has a smaller grain size.
What single factor controls humidity?
Humidity control is the regulation or saturation of water vapor in a mixture of air and water vapor. This is typically done through the use of a refrigerator or a humidifier which decrease and increase humidity respectively.
What is the most significant factor that controls the development of soil?
Parent Rock Type, Climate, Topography, Plants, and Animals
Which factor is a density-independent limiting factor?
volcanic eruption
What a density independent factor limiting population growth?
volcanic eruption
Is a density-independent factor limiting population growth?
volcanic eruption
What is pyroclasts in geography?
Pyroclasts are fragments of rock ejected during a volcanic eruption, ranging in size from ash to boulders. They are an important factor in determining the type and intensity of volcanic activity and can have significant impacts on the surrounding environment, including air quality, infrastructure damage, and landscape alterations.
The height of a volcano determines its explosive power?
While height can influence the explosivity of a volcano to some extent, it is not the sole determining factor. The composition of magma, the presence of gas and water, and the type of eruption (effusive vs explosive) also play crucial roles in determining a volcano's explosive power. Additionally, factors such as viscosity of magma and volatility of gases can further impact volcanic explosivity.
What are some triggers for volcanic eruptions?
In an inactive volcano, magma that is traveling towards the surface of the volcano can trigger eruption. Science is also indicating that earthquakes can be a causative factor in the eruption of a volcano.
A volcano may erupt explosively or quietly. Which factor has the least effect on the power of a volcanic eruption?
Height of the main vent of the volcano
A volcano may erupt explosively or quietly Which factor has the least effect on the power of a volcanic eruption?
Height of the main vent of the volcano
What are the three factors that influence the explosive nature of volcanic eruption?
following are the three factors affecting volcanic eruption or volcanic activity 1. temperature rise in interior which will cause rocks to melt 2. reduction in pressure which has already increased the melting temperature of rocks. 3. addition of fluids like water which helps in decreasing melting temperature of rocks
What can trigger a volcanic eruption?
In an inactive volcano, magma that is traveling towards the surface of the volcano can trigger eruption. Science is also indicating that earthquakes can be a causative factor in the eruption of a volcano.
What factor determaine the type of volcanic eruption?
The type of volcanic eruption is primarily determined by the composition of the magma beneath the volcano. Magma high in silica tends to be more viscous and leads to explosive eruptions, while lower silica magma tends to flow more easily, resulting in effusive eruptions. Other factors such as the presence of gas, the amount of pressure, and the shape of the volcano can also influence the type of eruption.
Which is a density-independent factor limiting population growth?
the effect of human disturbance on animal populations is
