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1 Nearly vertical, cylindrical body or opening in rock.

2 In mining, an ore shoot at the intersection of two barren veins.

3 At Kimberley, South Africa, pipes of diamond-bearing breccia.

4 In sedimentology, tube often filled with mud, particularly in limestones.

5 In volcanology, vertical channel-ways below a volcano through which magma flows towards the surface.

Subjects: Earth Sciences and Geography.

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