___ is a hard, compact, very fine-grained sedimentary rock composed entirely of silica.

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Chert is a hard, compact, very fine-grained sedimentary rock composed entirely of silica. It is often found in nodules or concretions and can occur in a variety of colors, including red, brown, gray, and black. Chert is commonly associated with limestone and shale formations and can be found in both marine and non-marine environments.

___ Is a Hard, Compact, Very Fine-Grained Sedimentary Rock Composed