Do you know why 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, increasing the activity of the magma 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. ‍‍

Think of the earth as a raw egg, and what we step on is actually the hard shell of the egg, which is our crust. And under the eggshell, there is actually a soft mantle, and the mantle layer is full of magma, which simply means that the underground pressure is too high, the temperature is too high, and the stones are melted. Or it can be understood from another angle, the hot magma, when it is cold on the earth's surface, condenses into a solid crust, which is the earth's crust.

Although it is a shell on the surface, this shell is not perfect, there are some large and small holes and cracks, and the magma in the ground will emerge from these cracks. This is what we see on the surface of the volcanic eruption. In fact, there are quite a lot of cracks in the earth's crust.

We divide the earth into continents and oceans, which are actually several large chunks of the earth's crust. For example, Eurasia is one piece, Africa is one, North and South America, Oceania, and Antarctica are also separate blocks. The surface of the ocean is water, and the underwater ocean floor also has the earth's crust, which is generally called the oceanic crust.

The principle of volcanic eruptions, the hot magma in the depths of the earth is ejected out of the surface along the pipes of the earth's crust, and the huge pressure is that once the magma is ejected from the ground, it will gradually cool and solidify, and over time, the accumulation of lava will form a volcano. Usually at the top of the volcano, there is a bowl-shaped depression, which is called a crater. The crater is connected by a lava pipe to the magma in the Earth's interior.

The Earth's interior is filled with red-hot magma. Under extreme pressure, magma can break through the earth's crust from weak spots and erupt, causing volcanic eruptions. The strength of volcanic eruptions is related to the nature of lava, and the eruption time can be as long as a few hours, and as long as thousands of years.

Volcanic eruptions are a strong way of showing the energy released by magma, that is, when the magma energy in the interior of the earth accumulates to a certain extent, it will erupt along the weak areas of the earth's crust under strong pressure, forming a spectacular volcanic eruption.

With the precipitation of gas in the magma, the internal pressure continues to increase, and the activity continues to intensify, and when the gas pressure reaches a certain limit, the magma will break through the "cover" and rush to the sky. Rushing to the ground like a fiery snake, the heavens and the earth seem to have returned to the period of flooding, which is the occurrence of a volcanic eruption.

I think it's the magma in the earth that's constantly moving, and the movement produces energy, and when the crust can't withstand the huge internal force, the magma erupts violently in the form of a volcanic eruption to release energy.

Magma and other eruptions are released from the crater to the surface in a short period of time, because the magma contains a large amount of volatiles, coupled with the confining pressure of the overlying layer, these volatiles are dissolved in the magma and cannot overflow, when the magma rises to the surface, the pressure decreases and the volatiles are released rapidly to form a volcanic eruption.

The temperature of the magma in the Earth's interior is very high, reaching up to 4,000 meters near the center. It can flow like molten iron in steelmaking. As the temperature of the Earth's interior rises, these gas-rich magma are like boiling gruel, which is always trying to spray out.

It's like firecrackers. The pressure inside the volcano continues to increase due to the toxic gases in the magma, and finally reaches a critical point. The cooled lava that accumulates in the crater above will be broken through, creating a violent **.

And the principle of rice cooker, the power energy is the injection in, the underground ** microepicenter energy. The rice cooker boils and overflows water and steam.

It is a peculiar geological phenomenon and a manifestation of the movement of the earth's crust.

1. Principle: The temperature and density of the earth's interior are uneven, 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.

With the use of the Omentous Cultivators, 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.

2. There is also a kind of volcanic cause due to plate interaction, such as in the subduction zone or collision zone of the plate, due to the friction to form a local high temperature, the dehydration of some water-bearing minerals also reduces the melting point of the rock, at this time it will also form a magma sac, thus triggering volcanic activity.