Volcanos
|
1
|
Volcano
|
The inner molten
magma of the interior of the earth erupts
on the surface of the earth through the vent is known as volcano
|
|
2
|
Types of volcanoes
|
I)
Based on the frequency of eruption, volcano is divided into three
types. 1) Active volcano, 2) Dormant
volcano, 3) Extinct volcano.
II)
Based on nature of eruption, they are divided into two types. 1)
Central type of volcano, 2) Fissure type of volcano.
III)
Based on nature of eruption
matter, they are classified into two types.
1) Explosive Type, 2) Placid Type.
IV)
Based on after eruption, they are classified into four types. 1) Lava Dome,
2) Shield volcanoes, 3) Cinder Cone, 4) Composite Volcano.
|
|
3
|
Active volcano
|
Active volcanoes erupt
in fairly frequent intervals. They are alive volcanoes. Ex: Mt. Etna in Italy (Europe) is an active
stratovolcano.
|
|
4
|
Dormant volcano
|
The volcano erupted
in the past and may be erupted in future. They are sleeping volcanoes. Ex:
Mt. Kilimanjaro in Tanzania (Africa)
|
|
5
|
Extinct volcano
|
The volcano erupted
in the long ago and never erupted again. They are dead volcanoes. Ex: Mt.
Kulal in Kenya (Africa)
|
|
6
|
Central type of
volcano
|
The volcano erupts
at a central point of the vent and forms a conical shape of hill. Ex: Mt.
Vesuvius in Italy (Europe)
|
|
7
|
Fissure type of
volcano
|
The magma erupts and spread the surface, forms shields or plateau. Ex:
Mt. Ray in Canada (N. America)
|
|
8
|
Explosive type of
volcano
|
Huge volume of gas,
steam, rocky particles, dust, smoke erupt with great force. Ex: Mt. Krakatoa
in Indonesia (Asia)
|
|
9
|
Placid type of
volcano
|
The magma rises to
the surface quietly with low intensity. Ex: Mauna Loa in Hawaiian Islands in Central
Pacific Ocean.
|
|
10
|
Lava Dome
|
Slow extrusion of
the viscous magma forms Lava Dome. Ex: St. Helens in USA
|
|
11
|
Shield volcano
|
Forms by low
viscosity highly fluid lava. Ex: Mt. Kilauea in Hawaiian Islands.
|
|
12
|
Cinder cone
|
conical shaped land
forms around the vent on the surface of the earth. Ex: MT. Mauna Kia in
Hawaiian Islands.
|
|
13
|
Composite volcano
|
Volcanic hill formed
my alternative layers of lava is a Composite volcano this is known as Strato volcano.
Ex: Mt. Fuji in Japan (Asia)
|
|
14
|
Vent
|
Vent is a narrow pipe
like shape which ejects from interior to surface of the earth as lava
|
|
15
|
Magma
|
Magma is the molten
form of the rocks found in the interior of the earth.
|
|
16
|
Lava
|
The inner molten
magma when flows on the surface of the earth is known as lava
|
|
17
|
Volcanoes of India
|
Barren Island in
Andaman region is the only volcano in
India. This is an active volcano and lastly erupted in 2017. Narcondam Island
is the dormant volcano located in Andaman Sea. Baratang Island in Andaman
region is the active mud volcano in India.
|
