Volcanic Landforms

• Geography
• Secondary Education

Volcanic landforms

Volcanic landforms

• ​Intrusive: Lava solidifies within the Earth's crust.
  
• Extrusive: ​Lava solidifies outside the crust.

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Batholith

1. They form the base of the mountain.
2. Large and coarse grained.
3. A part of the magma chamber also forms batholith.
4. Huge in size.

How did the Batholith come to the Earth's surface?

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Laccoliths

Lava Sill, that solidifies slowly and gives a dome shape.

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Observe this picture

How can we connect this with Lopoliths?

Lopoliths

Lava solidifies in a shallow saucer shaped basin.

Phacoliths

Lava solidifies on an anticline or base of a syncline.

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Dykes

Magma solidifies in vertical columns to form Dykes

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Batholith

Laccolith

Sill

Dyke

Lopolith

Extrusive Forms

Types

1. Ash and cinder cones
2. Lava domes
3. Lava Shields
4. Composite cones

Paricutín cinder cone volcano.

Lava Domes

Formed when acidic lava solidifies quickly forming steep sided cones.

Lava Shield

Formed when basic lava solidifies.

Broader than domes.

Composite volcano

Stratovolcano

1. Alternating layer of Lava and pyroclastic material.
2.  More than one vent
3. Ejects out lava and rock material.
4. Eg: Vesuvius, Fuji