The most powerful and spectacular volcanic eruptions often occur in subduction zones. The volcano here may erupt again after hundreds of years of silence, and once it erupts, its power is particularly fierce. This kind of volcanic eruption often brings disasters to mankind.

Affect the global climate

When a volcano erupts, a large amount of volcanic ash and gas will have a great impact on the climate. Because in this case, dark days, storms and even mud rain will bother local residents for months. Volcanic ash and gas are sprayed high into the air, and they will spread far away with the wind. These volcanic materials will block the sunlight and cause the temperature to drop. In addition, they will filter out some wavelengths of light, making the sun and the moon look like they are covered with a halo or have strange colors, especially at sunrise and sunset, which can form a strange natural landscape.

destroy the environment

A large amount of volcanic ash ejected by volcanic eruption combined with heavy rain to form debris flow, which can destroy roads and bridges, flood nearby villages and cities and make countless people homeless. Mud formed by soil and rock fragments can flood the whole city.

Although the rocks are covered by volcanic ash clouds, when the volcano just erupted, you can still see huge rocks spewing into the air.

Resurrect life

Volcanic eruption has a far-reaching impact on the natural landscape. Land is the most precious resource in the world, because it can breed all kinds of plants to support everything. If volcanic eruption can cover farmland with volcanic ash less than 20 cm thick, it is really a blessing for farmers, because these volcanic ash are rich in nutrition and can make the land more fertile.

1. After the lava disintegrated, weeds and liverworts began to appear.

2. Pteridophytes grow on the hillside where rope-like lava flows.

Volcanic ash enriches the surrounding land, and the local grapes are harvested every year.

Volcanic eruption presents a crazy side of nature. An erupting volcano may spew a hot red lava flow, or spew a lot of volcanic ash and volcanic gas. Such natural disasters may cause thousands of casualties, but most volcanic eruptions will only cause minor damage to life and property. Volcanic eruption is a natural disaster, which can occur all over the world, but it happens frequently in some areas.

Hazards of volcanoes

The most powerful and spectacular volcanic eruptions often occur in subduction zones. The volcano here may erupt again after hundreds of years of silence, and once it erupts, its power is particularly fierce. This kind of volcanic eruption often brings disasters to mankind.

2, the advantages of the volcano:

Volcanic eruption is a bad thing. People should stay away from those volcanoes that may erupt. However, it is very strange that the closer we are to these volcanoes, the denser the population. Italy's famous Vesuvius is an active volcano, which erupts regularly and takes many lives. However, people still live there. In Mexico, densely populated places are often places with volcanoes. Why is this?

Although volcanic eruption brings harm, volcanic ash is an excellent natural fertilizer and contains many nutrients needed by crops. Cuba and Indonesia are rich in sugar cane, and Central America is rich in fruit, all of which are related to the contribution of volcanoes. Volcanic eruption is dangerous, but in people's minds, I don't know when it happened. Therefore, after the volcanic eruption, people still go there to engage in production activities.

The greatest wealth of a volcano is its heat source. In areas where volcanic activity occurred not long ago or still exists now, a lot of hot water and hot gas are often hidden underground, which is a very valuable resource. There are dozens of thermal power stations in the world, such as El Salvador in Central America, which use 10 intermittent volcanic thermal energy to build power stations, and the power generation is equivalent to 20 times that of oil power stations in this country. The director of the engineering department of the University of Hawaii once pointed out that a geothermal test well with a depth of 2000 meters was drilled near the Kailai crater in Hawaii. If well water steam is used to generate electricity, it can generate 500 million kWh.

The thermal energy brought by volcanic eruption can not only generate electricity, but also be used for heating. Iceland is located near the Arctic Circle, with a very low annual average temperature. However, due to its location at the junction of the Eurasian plate and the American plate, there are frequent crustal movements, numerous volcanoes and abundant geothermal resources. Iceland's geothermal heating system is the largest and most perfect in the world, and all households in China15 have used volcanic steam to keep warm. The capital Reykjavik uses geothermal heating, which not only saves energy but also reduces environmental pollution. What's even more surprising is that this Nordic country near the Arctic Circle can produce tropical fruit-bananas by relying on greenhouses heated by hot springs! Iceland is not frozen, "four seasons are like spring", which is the credit of volcanoes.

Volcanoes have even increased the territory of some countries. 1973, near Nishishima, Japan, a piece of land was exposed to the water due to submarine volcanic eruption. The Japanese immediately officially named it the new island of Xizhi, which suddenly increased the territory of 0.24 square kilometers, which is also something to be happy about.