Question

explain the three types of volcanoes​

Answer 1

Answer:

Explanation:

There are three main types of volcano - composite or strato, shield and dome. Composite volcanoes, sometimes known as strato volcanoes, are steep sided cones formed from layers of ash and [lava] flows. ... Eruptions are explosive due to the thick, highly viscous lava that is produced by composite cone volcanoes.

Answer 2

Answer:

A volcano is a vent or an opening on the surface of the Earth’s crust through which hot solid, liquid and gaseous materials (Magma) erupt out to the surface from the Earth’s interior.

Based on the periodicity of eruptions, volcanoes are classified into

(i) Active volcano,

(ii) Dormant volcano

(iii) Extinct volcano.

(i) Active Volcano: Active volcanoes are those which constantly eject volcanic lava, gases and fragmented materials. (e.g.) Mount St. Helens in the United States.

(ii) Dormant Volcano: Volcanoes that do not show any sign of volcanic activity for a long period of time are known as dormant volcanoes. Sometimes there may be a sudden explosion. which may cause unimaginable loss to life and property (e.g. ) Mt. Fuji, Japan.

(iii) Extinct or Dead Volcano: When a volcano permanently stops its volcanic activity, then it is called as extinct or dead volcano (e.g.) Mt. Kilimanjaro, Tanzania.

Volcanoes can also be classified based on their structure and composition as composite volcano, shield volcano and dome volcano.

Types:

On the basis of shape, there are three types of volcanoes. They are:

• Shield volcano
• Cinder-cone volcano
• Composite volcano

1. Shield volcano:

• A shield volcano is formed by quiet eruption of lava with a low silica content. Such a volcano has a wide base and a cone with gentle slopes. Volcanoes of the Hawaii islands are of this type.

2. Cinder-cone volcano:

• Silica-rich magma traps gases inside the volcano until enough pressure is built to push the magma out of the earth's crust. When this type of volcano erupts, it shoots gases, ash, etc. with great force throwing them several kilometres up into the atmosphere. Such volcanoes have steep slopes and are made of cinder and ash. They are known as cinder-cone volcanoes. Many volcanoes of Mexico and Central America belong to this group.

3. Composite volcano:

• Composite volcanoes are made alternate layers of lava, cinder and ash. They are also called strato volcano. St. Helens is an example of composite volcano.