Define chert.

Understand the Problem

The question is asking for a definition of 'chert', which is a type of sedimentary rock. This requires looking up geological terminology.

Answer

Chert

Chert is a hard, fine-grained sedimentary rock composed of crystals of quartz (silica) that are very small in size.

Answer for screen readers

Chert is a hard, fine-grained sedimentary rock composed of crystals of quartz (silica) that are very small in size.

More Information

Chert breaks with a conchoidal fracture, often producing very sharp edges. Historically, it was used by Native Americans to make tools and weapons.

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