Podcast
Questions and Answers
A volcano is a place where what escapes to the ground through fissures and faults etc.?
A volcano is a place where what escapes to the ground through fissures and faults etc.?
Gases, ashes and/or molten rock material 'lava'.
Molten rock materials find their way to the surface from the asthenosphere.
Molten rock materials find their way to the surface from the asthenosphere.
True (A)
If materials remain below the surface, it is called lava.
If materials remain below the surface, it is called lava.
False (B)
If the materials find a way to come out on the surface, what is it called?
If the materials find a way to come out on the surface, what is it called?
Magma and lava form different types of structures called what?
Magma and lava form different types of structures called what?
What are structures formed by lava and other materials called?
What are structures formed by lava and other materials called?
Which of the following is an example of an extrusive landform?
Which of the following is an example of an extrusive landform?
Shield volcanoes are formed if the lava has high viscosity.
Shield volcanoes are formed if the lava has high viscosity.
What are the largest of all the volcanoes?
What are the largest of all the volcanoes?
What type of volcanoes form in many years after multiple eruptions and contain pyroclastic materials?
What type of volcanoes form in many years after multiple eruptions and contain pyroclastic materials?
When a large amount of magna erupts in a short time and the rock collapses, what depressions are formed?
When a large amount of magna erupts in a short time and the rock collapses, what depressions are formed?
Highly fluid lava, made of basalt, forms what when erupting on the surface?
Highly fluid lava, made of basalt, forms what when erupting on the surface?
When magma remains within the lithosphere and cools over there and forms different types of structures, what are they called?
When magma remains within the lithosphere and cools over there and forms different types of structures, what are they called?
What are large bodies of magmatic material that cools in the deeper depths of the crust and develops in the form of large domes?
What are large bodies of magmatic material that cools in the deeper depths of the crust and develops in the form of large domes?
What are large dome-shaped intrusive bodies with a level base and connected by a pipe-like conduit from below?
What are large dome-shaped intrusive bodies with a level base and connected by a pipe-like conduit from below?
When lava makes its way through cracks and the fissures developed, it solidifies almost perpendicular to the ground. What structures are formed?
When lava makes its way through cracks and the fissures developed, it solidifies almost perpendicular to the ground. What structures are formed?
Sills, like dykes, are vertical intrusive igneous landforms.
Sills, like dykes, are vertical intrusive igneous landforms.
What shape are Lapoliths?
What shape are Lapoliths?
Flashcards
What is a volcano?
What is a volcano?
A vent where molten rock, gases, and ash erupt onto the Earth's surface.
What is the Asthenosphere?
What is the Asthenosphere?
The layer in Earth's mantle where magma originates due to partial melting.
What is magma?
What is magma?
Molten rock beneath the Earth's surface.
What is lava?
What is lava?
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What are Volcanic Landforms?
What are Volcanic Landforms?
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What are Extrusive Landforms?
What are Extrusive Landforms?
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What is a Shield Volcano?
What is a Shield Volcano?
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What is a Composite Volcano?
What is a Composite Volcano?
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What is a Caldera?
What is a Caldera?
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What is a Flood Basalt Province?
What is a Flood Basalt Province?
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What are Intrusive Landforms?
What are Intrusive Landforms?
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What are Batholiths?
What are Batholiths?
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What are Lacoliths?
What are Lacoliths?
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What are Dykes?
What are Dykes?
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What are Sills?
What are Sills?
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What are Lapoliths?
What are Lapoliths?
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What causes Shield Volcanoes?
What causes Shield Volcanoes?
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What are Composite Volcano layers made of?
What are Composite Volcano layers made of?
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What process creates Calderas?
What process creates Calderas?
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What type of Lava creates Flood Basalt?
What type of Lava creates Flood Basalt?
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What creates Intrusive Landforms?
What creates Intrusive Landforms?
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What is example Shield Volcano?
What is example Shield Volcano?
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Example of Composite Volcano?
Example of Composite Volcano?
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One example of Flood Basalt Province?
One example of Flood Basalt Province?
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Why study Volcanic Landforms?
Why study Volcanic Landforms?
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What do Volcanoes expel?
What do Volcanoes expel?
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Are Dykes vertical or horizontal?
Are Dykes vertical or horizontal?
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Are Sills vertical or horizontal?
Are Sills vertical or horizontal?
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Batholiths are shaped like what?
Batholiths are shaped like what?
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Lacolith shape?
Lacolith shape?
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Study Notes
- A volcano is a place where gases, ashes, and/or molten rock material 'lava' escape to the ground through fissures and faults, etc.
- Molten rock materials from the asthenosphere rise to the surface.
- Magma remains below the surface.
- Lava appears on the surface.
- Magma and lava create various Volcanic Landforms that can be extrusive or intrusive.
Extrusive Landforms
- Extrusive landforms are structures formed by lava and other materials like ashes and pyroclastic materials; examples include Shield Volcano, Composite Volcano, Caldera, and Flood Basalt Province.
- Shield volcanoes are created by low viscosity lava, resulting in gentle slopes.
- After the Basalt province, shield volcanoes are the largest types of volcanoes, such as Mauna Loa, Hawaiian Islands, USA, and Galapagos Islands.
- Composite Volcanoes develop over many years from multiple eruptions and contain pyroclastic materials and ashes along with thick, viscous magmatic lava.
- Mount Kilimanjaro and Mount St. Helens are Composite Volcanoes.
- Caldera are depressions formed when a large amount of magma erupts quickly, causing the underlying rock to collapse which are the most explosive in nature.
- Highly fluid lava, made of basalt, forms a flood basaltic province when erupting on the surface, demonstrated by the Deccan Trap.
Intrusive Landforms
- Intrusive landforms are structures formed when magma remains within the lithosphere and cools, including Lacoliths, Phacoliths, Lapoliths, Sills, Dykes, and Batholiths.
- Batholiths are large bodies of magmatic material that cool deep in the crust, forming large domes and representing the cooled portions of magma chambers.
- Lacoliths are large, dome-shaped intrusive bodies with a level base connected to a pipe-like conduit from below.
- Dykes are wall-like structures formed when lava flows through cracks and fissures, solidifying almost perpendicular to the ground, commonly found in western Maharashtra.
- Sills are thin, horizontal intrusive igneous landforms, differing from dykes.
- Lapoliths are saucer-shaped intrusive volcanic landforms, concave to the sky.
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Description
Volcanoes release gases, ashes, and lava onto the surface through fissures. Magma rises from the asthenosphere, becoming lava upon reaching the surface. This process forms various volcanic landforms, both extrusive, like shield and composite volcanoes, and intrusive.
