1. Construction: Limestone is a major component of cement and concrete, used to build roads, buildings, bridges, and other structures.

2. Agriculture: Crushed limestone is used as a soil amendment to neutralize acidity and provide calcium, which is essential for plant growth.

3. Industry: Limestone is used in the production of steel, glass, and paper. It's also used to neutralize acidic waste in industrial processes.

4. Decorative: Limestone is a popular material for sculptures, monuments, and building facades. It can be polished for a smooth, elegant finish.