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sill
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sill

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Igneous intrusions can be a variety of shapes and sizes. Laccoliths are domed circular shapes, and can be many miles across. Sills are intrusions that flow between rock layers. Pipes or necks connect the underlying magma chamber to surface volcanoes.

Sheet of igneous rock created by the intrusion of magma (molten rock) between layers of pre-existing rock. (A dyke, by contrast, is formed when magma cuts across layers of rock.) An example of a sill in the UK is the Great Whin Sill, which forms the ridge along which Hadrian's Wall was built.

A sill is usually formed of dolerite, a rock that is extremely resistant to erosion and weathering, and often forms ridges in the landscape or cuts across rivers to create waterfalls.



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? Mentioned in ? References in periodicals archive
 
They pushed themselves graphically, followed every lead, collected every book and leaflet, drank, sang and giggled hard, their studio always open, littered with red wine bottles on the window cills and white wine in the several refrigerators.
Peter Cook: the Oslo architecture scene is now a mere shadow of its ... by Cook, Peter / The Architectural Review
With windows flush to vertical internal wall, the Pietra di Lecce folds in from the facade to wrap reveals, lintels and cills, so augmenting the perception of building mass.
Adriatic station: a civilized new services building in the historic ... by Ryan, Raymund / The Architectural Review
If you include symmetrical bays to east and west, and projecting cills (for sculpture) north and south, the plan is a perfect square.
Court completed: a very sensitive addition to a fine early nineteenth ... by The Architectural Review
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