`color{blue}✎` On the basis of mode of eruption Central Eruption or Explosive Type Here, the magma comes with great force through the small vent and spread to a distant position. e.g. Hawaiian type, Strombolian type, Pelcan type, Visuvius type, Volcanion type.

Fissure Eruption or Quiet Eruption : Large quantities of lava quietly flow up from fissures and spread out over the surrounding areas. Successive flow of lava results in the growth of lava plateau. e.g. Deccan Plateau.

`color{blue} ✍️` On the basis of periodicity of eruptions

Active Volcano : Volcano which errupt periodically. e.g. Etna, Stromboli, Mayon.

Dormant Volcano : Volcano which become quiet after their eruption for some time. e.g. Fujiyama, Krakatoa, Barren Island.

Extinct Volcano : They have no indication of future eruption.

`color{blue}✎` The most common type of volcano is the strato or composite. These are tall mountains that have steep sides and which have alternated magma and layers of rock.

`color{purple} {"Eruption Classification"}`
There are two types of classification of volcanoes based on eruption and these are `color{blue}{"central or explosive"}` and `color{blue}{"fissure or quiet"}`.

`color{green} ✍️` There are several factors that go into account when attempting to classify a volcano into a group and that includes things like recent activity, periodicity of eruptions, size, potential impact and others.

`color{green} ✍️` Though it is not common to hear it volcano eruptions are actually not that rare. More often than not the classification of volcanoes refers to the life cycle and that could define them as `color{blue}{"active, extinct or dormant"}`.

`color{green} ✍️` However, a volcano can also be classified by the composition of the structure and that would mean that it can be a shield, conical or stratovolcano. Finally they can also be classified because of its eruption which could be quiet or explosive.

`color{green} ✍️` Following figure given on the right shows the different types of volcanoes.

`color{purple} {"Various Volcanic Belts"}`

`color{blue} ►`Circum-Pacific Belt (Fire girdle of the pacific or the fire ring of the pacific) : It extends across the Kamchatka Peninsula, Kurile Islands, the Islands of Japan, Philippines, New Guinea, New Zealand and the Soloman Islands.

`color{blue} ►`Highest Volcanic Peaks Cotopaxi (South America), Fujiyama (Japan, Valley of ten thousand smokes (Alaska).

`color{blue} ►`Mid-Continental Belt (Volcanic zones of convergent continental plate margins) : It includes volcanoes of Air inc mountain chain, the Mediterranean sea and the fault zone of Eastern Africa of Stromboli, Vesuvias, Etna, Kilimanjaro etc.

`color{blue} ►`Mid-Atlantic Belt in which the volcanoes are fissure eruption type, e.g. Iceland, Canary Islands, Cape Verde, Azores etc.

`color{blue} ✍️` A volcanic mountain starts out as a simple crack in the Earth called a volcanic vent. Magma erupts out of the ground as lava flows, clouds of ash, and explosions of rock.

`color{blue} ✍️` This material falls back to Earth around the vent, and piles up around it. Over time (and sometimes quite quickly) a volcanic mountain builds up, with the familiar cone shape.

`color{blue} ✍️` Following is the list of important volcanic mountains of different countries:

`color{blue}✎` Weathering is the breakdown of rocks at the Earth's surface, by the action of rainwater, extremes of temperature, and biological activity. It does not involve the removal of rock material.



`color{blue} ✍️` It can be classified into the following :

`color{blue}{1.}` physical weathering is also known as Mechanical weathering . Mechanical weathering is the physical breakdown of rocks into smaller and smaller pieces. One of the most common mechanical actions is frost shattering. It happens when water enters the pores and cracks of rocks, then freezes. Frost weathering, frost wedging, ice wedging or cryofracturing is the collective name for several processes where ice is present. These processes include frost shattering, frost-wedging and freeze-thaw weathering.


`color{blue}{2.}` Organic or biological weathering refers to the same thing. It is the disintegration of rocks as a result of the action by living organisms. Trees and other plants can wear away rocks since as they penetrate into the soil and as their roots get bigger, they exert pressure on rocks and makes the cracks wider and deeper. Eventually, the plants break the rocks apart. Some plants also grow within the fissures in the rocks which lead to widening of the fissures and then eventual disintegration.


`color{blue}{3.}` Chemical weathering happens when rocks are worn away by chemical changes. The natural chemical reactions within the rocks change the composition of the rocks over time. Because the chemical processes are gradual and ongoing, the mineralogy of rocks changes over time thus making them wear away, dissolve, and disintegrate.

`color{blue} ✍️` Erosion is a process where natural forces like water, wind, ice, and gravity wear away rocks and soil. It is a geological process, and part of the rock cycle. Erosion occurs at the Earth's surface, and has no effect on the Earth's mantle and core.

`color{blue} ✍️` Most of the energy that makes erosion happen is provided by the Sun. The Sun's energy causes the movement of water and ice in the water cycle and the movement of air to create wind.

`color{blue} ✍️` Erosion can cause problems that affect humans. Soil erosion, for example, can create problems for farmers. Soil erosion can remove soil, leaving a thin layer or rocky soil behind. Erosion can also cause problems for humans by removing rocks or soil that support buildings.