In some instances, a layer of lava will cool down to form the characteristic pillar-like structure called columnar
jointing. As this cooling effect occurs after the eruption, columnar jointing does not help in the study of volcanoes
themselves. However, the jointing helps to control weathering and erosion, giving the well-known patterns of the
Giant’s Causeway and Fingal’s Cave.
This photograph shows part of the longest outcrop of columnar jointing in Iceland.
Geopix Study Topic “Columnar Jointing” (See below)
- gives full images of the examples shown below
- describes the form and origin of columnar jointing
- shows how scenery is affected
- suggests how to answer exam questions on this topic
The Volcanoes: "Columnar Jointing" Study Topic is part of the Geopix Volcanoes Study Guide CD.
To order this CD go to the Geopix
Online Store
The Study Topic contains the following pages:
