limestone
/'laimstoun/
Definition
- Noun:
- A sedimentary rock: A type of rock that forms from the accumulation and compression of mineral and organic particles over long periods.
- Composed mainly of calcium carbonate: Its primary chemical component is CaCO₃, which originates from the skeletal fragments of marine organisms such as coral and shells.
Examples of Usage
- Noun:
- The region is known for its extensive limestone caves.
- Limestone is often used in the construction of buildings and monuments.
- Acid rain can slowly dissolve limestone structures.
Advanced Usage
- "Karst topography": A landscape formed from the dissolution of soluble rocks like limestone, characterized by sinkholes, caves, and underground streams.
- The region's karst topography, shaped by limestone, attracts many geologists.
Variants and Related Words
- Limestone pavement (n): A natural karst landform consisting of a flat, incised surface of exposed limestone.
- We hiked across the ancient limestone pavement.
- Limestone quarry (n): An open-pit mine where limestone is extracted.
- The old limestone quarry is now a popular swimming spot.
Synonyms
- Calcareous rock: A general term for rocks rich in calcium carbonate.
- Chalk: A soft, white, porous sedimentary rock, a form of limestone composed of the mineral calcite.
Related Phrases
- "As solid as limestone": An idiom implying something is very hard, durable, or resistant to change.
- Their agreement was as solid as limestone.
Noun
-
a sedimentary rock consisting mainly of calcium that was deposited by the remains of marine animals
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