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Intrusive Volcanic Features

1) Intrusive volcanic features are formed within the earth's crust when magma is unable to reach the surface and instead solidifies underground. 2) Examples of intrusive features include dykes, which form when magma is forced between existing rock layers, and batholiths, large masses of intrusive igneous rock that form deep underground. 3) Sills are another type of intrusive feature, formed when magma forces its way within existing rock layers but does not cut through the entire thickness of the rock.

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887 views3 pages

Intrusive Volcanic Features

1) Intrusive volcanic features are formed within the earth's crust when magma is unable to reach the surface and instead solidifies underground. 2) Examples of intrusive features include dykes, which form when magma is forced between existing rock layers, and batholiths, large masses of intrusive igneous rock that form deep underground. 3) Sills are another type of intrusive feature, formed when magma forces its way within existing rock layers but does not cut through the entire thickness of the rock.

Uploaded by

Isabella persad
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Form Four Geography


Volcanic features
Intrusive and Extrusive volcanic features

Magma when ejected from volcanoes is known as lava and forms extrusive
volcanic features or landforms.
Magma that is unable to reach the surface eventually solidifies underground and
creates intrusive volcanic features.
Intrusive features or landforms formed within the earth’s crust.
Magma that is unable to reach the surface is forced between existing layers of rock
and forms intrusions of various shapes.
https://www.geoforcxc.com/our-planet/volcanic-activity/

Examples of
dykes: The
Great Dyke
of
Zimbabwe.
2
3

Example of a Batholith is the Coast Range Mountains Batholith of British Colombia, Canada
https://www.youtube.com/wtcha?v=6loGYTCBVqo
Dykes and sills formation.
https://www.youtube.com/watch?v=Nboq5zsLxFE
Intrusive volcanic features
https://www.youtube.com/watch?v=vfIUYDjo8WM
Movie Dantes Peak, pyroclastic flow
Read the above and answer the following questions below. Do answers on separate
writing paper. Please keep the information provided for your notes and revision
purposes.
Revision Questions:
1. Explain the difference between intrusive and extrusive volcanic features.
2. Describe the formation of intrusive volcanic features such as dykes, sills and
batholiths.

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