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Question
What is sills?
Short Answer
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Solution
Sills are horizontal intrusions of magma that have forced their way between layers of existing rock and solidified there. Unlike dykes, which cut vertically across rock layers, sills lie parallel to the bedding planes. When the magma cools and hardens in these horizontal cracks, it forms a flat, sheet-like body of igneous rock.
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Rock and it's Types
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Chapter 6: Rocks - EXERCISES [Page 64]
