limestone
UK: ˈlaɪmstəʊn | US: ˈlaɪmstoʊn
n. a sedimentary rock composed primarily of calcium carbonate, often formed from the remains of marine organisms and used in construction and industry.
The word "limestone" is a straightforward compound of "lime" (derived from Old English līm, meaning "sticky substance" or "calcium oxide") and "stone" (Old English stān, meaning "rock"). Historically, "lime" referred to the alkaline material derived from heating limestone, while "stone" denoted its solid, rocky form. The term reflects the practical recognition of this rock's role in producing lime for mortar and other uses.
The cliffs along the coast are made of porous limestone.
Limestone is often used as a building material due to its durability.
Fossils are frequently found in limestone deposits.
The quarry extracts limestone for cement production.
Acid rain can erode limestone structures over time.