Why do Volcanos Erupt?

gray scale photo of active volcano

Magma is a major driving force for volcanic eruptions.

Magma is a major driving force for volcanic eruptions. Magma is a mixture of molten rock and gases that are found beneath the Earth’s crust.

The word magma comes from the Greek word “to melt”. Magma is formed near the Earth’s core, where temperatures can reach thousands of degrees Fahrenheit.

When rocks become so hot that they melt into magma, they release gases into their surroundings; this process may cause earthquakes or tremors prior to an eruption due to rising pressure on magma reservoirs beneath volcanoes.

Crustal Plates play a large role in the natural process of volcanoes erupting.

Many volcanoes erupt due to the movement of crustal plates. The Earth is made of several large pieces that make up its surface, called tectonic plates. These pieces move slowly over time, and are constantly moving because of their opposing forces. If a plate is forced underneath another plate by friction, it will rise up to form mountains; this is called subduction.

The plates themselves are made up of rock and magma (molten rock) which causes them to be very hot because they can never cool down completely even though they are far below the earth’s surface. The fact that they are always in motion makes them susceptible to faults or cracks within the rocks above them that can cause earthquakes when pressure builds up during movement within these areas or if something comes along and breaks through one side of the fault line causing it to shift which causes friction between both sides until one side gives way causing energy release as well as destruction from this event as well as any other events like volcanic eruptions caused by nearby earthquakes occurring simultaneously with each other over an extended period making conditions perfect for natural disaster type scenarios such

Earthquakes are also a factor in volcanic eruptions.

Earthquakes are also a factor in volcanic eruptions. Earthquakes can trigger volcanic eruptions, cause magma to rise to the surface, cause magma to erupt, and even change the direction of an eruption.

If you were standing near Mount Vesuvius when it erupted in AD 79, you would have heard loud booming noises coming from below. These sounds were caused by earthquakes that occurred deep underground—the same temblors that caused Pompeii’s destruction years earlier. The quakes opened up cracks in surrounding layers of rock and allowed molten lava (or magma) from within Earth’s mantle to escape into these fissures and erupt into the air as fiery jets of ash and lava called pyroclastic flows. By causing these earthquakes at Vesuvius, nature has demonstrated how seismic activity can affect volcanoes on Earth—and perhaps even other planets as well.

Water and ice also play major roles as external factors that can trigger volcanic eruptions.

  • Water and ice also play major roles as external factors that can trigger volcanic eruptions. When water is heated, it expands and turns into steam. The steam creates pressure in the earth’s crust, which then causes the magma to rise up through the cracks in the crust until it erupts to the surface of the earth. This is how volcanoes can produce geysers, or jets of hot water that shoot off from inside a volcano (like Old Faithful).
  • It is also possible for an eruption to occur when there are large amounts of ice present at high altitudes on mountains around a volcano. If this happens, then gravity may pull on these large chunks of ice and cause them to break off their perches atop mountains and fall down into valleys below—thereby triggering an eruption!

A combination of these factors ultimately leads to volcanic eruptions.

Here are the major factors that can lead to a volcanic eruption:

  • Magma is the driving force for volcanic eruptions. It’s a hot, molten rock that rises up through the crust, and when it reaches the surface it causes an explosion.
  • Crustal plates are the main internal factor in determining whether or not a volcano will erupt. When two huge tectonic plates collide, they move against each other until one breaks off and slides under another plate (subduction). This movement causes earthquakes and sends magma upward toward Earth’s surface where it creates volcanoes.
  • External factors can trigger dormant volcanoes as well as active ones—these include earthquakes, landslides or heavy rainfall over long periods of time (which may cause water pressure buildup beneath Earth’s surface). Earthquakes are also responsible for causing tsunamis—they cause shifts in seafloor crusts and create giant waves when they reach land masses near oceanic trenches like those found along Indonesia’s coastlines.”

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