How is a sill different from a dike?
Intrusive Igneous Bodies:
Intrusive igneous bodies are formed by magma that rises from the mantle without reaching the surface. There are several types of intrusive igneous bodies, such as batholiths, sills, dikes, and laccoliths. The types of igneous structures are identified by their size, shape, and orientation relative to the surrounding country rock.
Answer and Explanation:
Sills and dikes are both types of intrusive igneous bodies. They tend to have longer, narrower shapes than batholiths. Sills are intrusive igneous bodies that are emplaced parallel to the bedding planes of the country rock (preexisting rock), and dikes are emplaced across the beds of country rock.
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from General Studies Earth & Space Science: Help & ReviewChapter 5 / Lesson 4