carbonate of chalk

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• Chalk (disambiguation) — Chalk may refer to: Chalk, a soft, white, porous form of limestone, composed of calcium carbonate Blackboard chalk, calcium sulfate, also marketed as sidewalk chalk Chalk (drying agent), magnesium carbonate, used for hands in rock climbing,… …   Wikipedia

• Chalk — (ch[add]k), n. [AS. cealc lime, from L. calx limestone. See {Calz}, and {Cawk}.] 1. (Min.) A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition as common… …   The Collaborative International Dictionary of English

• Chalk drawing — Chalk Chalk (ch[add]k), n. [AS. cealc lime, from L. calx limestone. See {Calz}, and {Cawk}.] 1. (Min.) A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition as… …   The Collaborative International Dictionary of English

• Chalk formation — Chalk Chalk (ch[add]k), n. [AS. cealc lime, from L. calx limestone. See {Calz}, and {Cawk}.] 1. (Min.) A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition as… …   The Collaborative International Dictionary of English

• Chalk line — Chalk Chalk (ch[add]k), n. [AS. cealc lime, from L. calx limestone. See {Calz}, and {Cawk}.] 1. (Min.) A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition as… …   The Collaborative International Dictionary of English

• Chalk mixture — Chalk Chalk (ch[add]k), n. [AS. cealc lime, from L. calx limestone. See {Calz}, and {Cawk}.] 1. (Min.) A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition as… …   The Collaborative International Dictionary of English

• Chalk period — Chalk Chalk (ch[add]k), n. [AS. cealc lime, from L. calx limestone. See {Calz}, and {Cawk}.] 1. (Min.) A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition as… …   The Collaborative International Dictionary of English

• Chalk pit — Chalk Chalk (ch[add]k), n. [AS. cealc lime, from L. calx limestone. See {Calz}, and {Cawk}.] 1. (Min.) A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition as… …   The Collaborative International Dictionary of English

• Carbonate Compensation Depth — (CCD) is the depth in the oceans below which the rate of supply of calcium carbonate (calcite and aragonite) equals the rate of solvation, such that no calcium carbonate is preserved. Calcium carbonate is essentially insoluble in sea surface… …   Wikipedia

• chalk — ► NOUN 1) a white soft limestone (calcium carbonate) formed from the skeletal remains of sea creatures. 2) a similar substance (calcium sulphate), made into sticks and used for drawing or writing. ► VERB 1) draw or write with chalk. 2) Brit.… …   English terms dictionary

• Carbonate rock — Carbonate rocks are a class of sedimentary rocks composed primarily of carbonate minerals. The two major types are limestone and dolomite, composed of calcite (CaCO3) and the mineral dolomite (CaMg(CO3)2) respectively. Chalk and tufa are also… …   Wikipedia