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limestone chalk difference

Chalk | Encyclopedia chalk, mineral of calcium carbonate, similar in composition to limestone, but softer. It is characteristically a marine formation and sometimes occurs in great thickness; the chief constituents of these chalk deposits are the shells of minute animals called foraminiferans . What Is the Difference Between Sidewalk Chalk & Chalkboard ... Sidewalk chalk and chalkboard chalk were once made of calcium carbonate. Calcium carbonate is a type of soft limestone that forms underwater. Sidewalk chalk and chalkboard chalk are now made from the mineral calcium sulfate, or gypsum, explains the Earth Science Picture of the Day website. Reservoir Rock & Source Rock Types: Classification ... PETR 571 Week 3- notes 1 Reservoir Rock & Source Rock Types: Classification, Properties & Symbols Reservoir rock: A permeable subsurface rock that .    Read More

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