Why do volcanoes erupt? How volcanoes erupt

A volcanic eruption is a phenomenon when magma in the earth's crust rushes out of the ground. The temperature inside the earth is high, and the rocks exist in the form of liquids, which are called magma. In normal times, the pressure under the ground is very high, and the magma is tightly wrapped in the earth's crust, and it is not easy to rush out of the ground.

However, in places where the earth's crust is more fragile, the pressure underground is less than that of the surrounding areas, and the gas and water in the magma may be separated, strengthening the magma's activity and pushing the magma out of the ground. When the magma rushes out of the ground, the gas and water vapor in the magma quickly separate, and the volume expands dramatically, and the volcanic eruption occurs.

Volcanic eruptions are caused by the uneven temperature and density of the Earth's interior, forming mantle convection or mantle plumes inside the mantle. When a hot substance rises to the shallow part of the earth, partial melting occurs due to a decrease in pressure. Under the action of external forces, these molten materials come together and form magma sacs in the shallow part of the earth.

When the pressure of the magma sac is greater than the pressure of the formation, the magma breaks through the earth's crust along the fault or weak point, causing a volcanic eruption.

The cause of volcanic eruptions is the result of magma eruptions within the earth's crust.

The theory of plates is the doctrine of calamity to the country and the people.

In chemical experiments, chemical changes occur in substances, heat energy and kinetic energy appear, chemical changes occur in the interior of the earth, and chemical changes in the interior of the earth form huge heat and kinetic energy, resulting in volcanic eruptions. This is the most scientific answer.

The result of geocentric activity.

Because a volcano can only be formed if it erupts. So that's his job.

When the heat energy of the earth's crust accumulates to a certain extent, it is released outward, and the released energy is erupted from some active volcanoes.

Gas: In the gestation stage of volcanic eruption, due to the occurrence of gas dissolution and earthquake swarm, the degree of fracture of the overlying rock increases, the pressure decreases and the amount of gas dissolution in the magma body increases, the magma volume gradually expands, the density decreases, and the internal pressure increases, when the pressure of the inner surface of the overlying rock greatly exceeds the external pressure, the gas occurs violently in the fracture density zone of the overlying rock, which breaks the rock and hits the channel of the mountain eruption, and the fragments are ejected first, followed by the eruption of magma; Formation of the eruption column: After the gas**, the gas ejects the cuttings and deep magma in the channel to the air with great ejection force, forming the eruption column; Collapse of the eruption column:

During the ascent process, the eruption column carried debris of different particle size and density, which collapsed at different heights and at different stages according to the gravity.

The technical term for a volcanic eruption is a form of crustal movement, in which heat energy accumulates from the crust.

After a certain point, it will be released outward, and the released energy will erupt from some active volcanoes. However, it usually does not erupt for no reason, but after a certain amount of pressure, it will erupt from the surface of the weak hair. It is usually the pressure caused by the movement of the earth's crust.

There are three main types of volcanoes, namely active volcanoes, extinct volcanoes, and dormant volcanoes. Generally, volcanoes that erupt are active volcanoes, and extinct volcanoes are almost impossible to erupt. As far as our country is concerned, there are many extinct volcanoes in our country, but there is almost no possibility of eruptions.

Dormant volcanoes are different, they only enter a dormant state temporarily, and if they wake up at a certain time, they will erupt. Dormant volcanoes actually.

It's just that an active volcano has gone into a dormant state.

Many people may not have encountered volcanoes, so they feel that volcanoes are not as harmful as **, but once the real volcano erupts, it is much more terrifying than **, you must know that many of the extinction of dinosaurs in the past was caused by volcanic eruptions, so once a large volcano erupts, human beings may become extinct.

But at present, the current volcano will not erupt en masse like then, so humans can still be on fire for some years. So, how terrifying are volcanic eruptions? A normal fire can burn down a house and trees, let alone magma from a volcanic eruption.

Maybe you've seen magma from a lot of ****, isn't it the same as the iron slurry in the iron-burning furnace? As soon as that one is poured down, everything will die or be reduced to ashes. In particular, the nearby villages are likely to be submerged and burned.

In addition to this devastating hazard, the smoke and gases emitted when it erupts can affect the global climate. These gases merge into cumulonus clouds and form rainfall, which can also lead to storms.

Of course, there are pros and cons to everything, and sometimes volcanic eruptions can bring us certain benefits. After a volcanic eruption, the soil becomes more fertile and the plants regrow and grow more of high quality. A lot of mineral resources will also be formed.

So, how do we escape in the face of a volcanic eruption? First of all, you know the precursors of volcanic eruptions: there will be noticeable on the surface.

Some underground outlets will have peculiar smells, such as vents, springs, etc.: some animals and plants will die abnormally; The water level and temperature will be different.

Often, etc. If you notice this kind of phenomenon, you should evacuate the area as soon as possible, and you can choose the fastest means of transportation to leave, and you need to protect your head with something in the process.