|chalk (chôk) Pronunciation Key
A soft, white, gray, or yellow limestone consisting mainly of calcium carbonate and formed primarily from the accumulation of fossil microorganisms such as foraminifera and calcareous algae. Chalk is used in making lime, cement, and fertilizers, and as a whitening pigment in ceramics, paints, and cosmetics. The chalk used in classrooms is usually artificial.
Dictionary.com presents 366 FAQs, incorporating some of the frequently asked questions from the past with newer queries.