tor formation
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![Page 1: Tor formation](https://reader033.vdocuments.net/reader033/viewer/2022061115/5464b3baaf79592e0f8b57ef/html5/thumbnails/1.jpg)
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Granite Tors start to form when magma that has intruded into the crust cools to form a batholith. The softer rock above the batholith erodes away over time leaving the batholith exposed to the elements.
While the rock is cooling it starts to contract causing cracks- these also occur when the batholith is exposed and pressure is released.
The cracks in the Granite rock are made worse by the process of freeze-thaw weathering, this is the process where water gets into the cracks in the rocks and freezes when the temperature drops, expanding by 9%, this repeated process causes the cracks in the rock to widen. This process affects the Tor more where the joints are closer together.
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As this freeze-thaw weathering continues bits of Rock start to break off, the name for these pieces of rock is scree.
This type of weathering leaves the Tor with certain characteristics:
1. The joints also become visible in the Tor,
2. The Tors edges are smooth and round.
Horizontal Bedding Planes
Smooth Round Edges
Vertical Joints
![Page 4: Tor formation](https://reader033.vdocuments.net/reader033/viewer/2022061115/5464b3baaf79592e0f8b57ef/html5/thumbnails/4.jpg)
Case study: Dartmoor
Dartmoor has many Tors and is a popular popular place with tourists.
Most of the Dartmoor Tors are located in the Dartmoor national park, this makes it an ideal place to visit for tourists.
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Bowermans nose:
Examples of Dartmoor Tors:
Black Tor
Hay Tor Hound Tor
![Page 6: Tor formation](https://reader033.vdocuments.net/reader033/viewer/2022061115/5464b3baaf79592e0f8b57ef/html5/thumbnails/6.jpg)