What is a sill in geology?
Igneous rocks can often create intrusive formations. This is because igneous rocks form when magma cools and solidifies. In its liquid form, magma can flow into any cracks, voids, or channels in the surrounding rock.
Answer and Explanation:
In geology, a sill is a horizontal layer of intrusive rock that forms between two older layers of rock. Often, the rock is igneous in nature and forms when a vertical intrusion called a 'dike' reaches an area where the magma can spread out horizontally.
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from Earth Science 101: Earth ScienceChapter 7 / Lesson 2