Linked from
The 111 pages that link to Limestone, each with the reason it gives.
Sedimentary rockBroader topic: It commonly forms from shell material or carbonate precipitation.
CarbonateBroader topic: It is a major geological reservoir of carbonate ions.
QuarryingBroader topic: It is quarried for building stone, aggregate, and cement manufacture.
Carbonate rockBroader topic: It is the most widespread carbonate-rock type.
Calcium cycleBroader topic: It is a large calcium store that can return calcium through weathering.