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New cave-dwelling arachnids discovered in Brazil

Two new species of cave-dwelling short-tailed whipscorpions have been discovered in northeastern Brazil, and are described in research published May 22 in the open access journal PLOS ONE by Adalberto Santos ...

Biology - Plants & Animals

May 22, 2013

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Limestone

Limestone is a sedimentary rock composed largely of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO3). Many limestones are composed from skeletal fragments of marine organisms such as coral or foraminifera.

Limestone makes up about 10% of the total volume of all sedimentary rocks. The solubility of limestone in water and weak acid solutions leads to karst landscapes, in which water erodes the limestone over thousands to millions of years. Most cave systems are through limestone bedrock.

Limestone has numerous uses, including as a building material, as aggregate to form the base of roads, as white pigment or filler in products such as toothpaste or paints, and as a chemical feedstock.

This text uses material from Wikipedia, licensed under CC BY-SA

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