Distribution of volcanoes
A volcano is an opening in the earth’s crust through which lava, volcanic ash, and gases escape.
Volcanoes are generally found in the weak zones of the earth’s crust.
These zones are found on the meeting zones or plate margins of the continents and ocean basins.
Like volcanoes fold mountains are also associated with the ‘weaker zone’.
For example mountains like Andes, Alps, and Himalaya are found in the weaker zone.
Let's discuss the important volcanic zones of the world
The Circum-Pacific Belt
This is the most important belt of volcanoes and also known as ‘Ring of Fire’.
There is a 3200 km volcanic chain through southern Alaska, Alaska peninsula and Aleutian Islands. It is one of the most volcanically active parts in the world.
There are 80 active volcanoes and 10 calderas in this belt.
A caldera is a large depression formed when a volcano erupts and collapses.
An interesting island peak called Bogoslof is present in this region.
The interesting part is that it emerges periodically. It rises 1500 meters from the sea floor.
These are the volcanoes of Mid-Atlantic ridge.
Most of the volcanoes in this belt erupted through a line like opening known as fissure eruption.
Mid-Atlantic Belt includes volcanoes of-
The lesser and southern Antilles
The Azores mountain
St. Helena volcano etc.
This belt includes, volcanoes of Mediterranean sea
Volcanoes of Aegean sea
Mount Ararat in Turkey
The Elburz mountain
and the Himalayas.
Volcanoes are found in the weak zone of the earth’s crust. These zones are found on the plate margins of the continents and ocean basins.
The Circum-Pacific Belt is the most important belt of volcanoes and known as ‘Ring of Fire’. It includes a chain of countries.
Mid-Atlantic Belt are the volcanoes of Mid-Atlantic ridge. It includes volcanoes of- lesser and southern Antilles, Azores, St. Helena etc.
This belt includes volcanoes of Mediterranean sea, Aegean sea, Elburz, Hindukush and Himalayas.