Natural Sources:

* Quarries: These are open-pit mines where limestone is extracted directly from the earth.

* Mines: Some limestone deposits are mined underground using tunnels and shafts.

* Coastal areas: Limestone is often found in coastal areas where it has been exposed by erosion.

Man-made Sources:

* Crushed stone plants: These facilities process raw limestone into smaller pieces for various uses.

* Recycled sources: Limestone can be recycled from construction and demolition waste.

Location:

Limestone deposits are found around the world, but some of the largest producers include:

* China: The world's largest producer of limestone.

* India: A major producer with significant limestone reserves.

* United States: Large deposits in various states, including Indiana, Illinois, and Missouri.

* Europe: Significant limestone deposits in countries like France, Germany, and Italy.

Finding Limestone:

* Geological maps: These maps can help you identify areas where limestone is likely to be found.

* Government agencies: Government agencies responsible for natural resources can provide information on limestone deposits in your area.

* Local quarries and mines: These businesses may be able to tell you where they source their limestone.

Remember, before extracting limestone, it is essential to follow all regulations and ensure responsible and sustainable practices.