1. Construction: Limestone is a key ingredient in cement, a crucial component of concrete, which is used extensively in building houses, roads, bridges, and other structures. It is also used directly as aggregate in concrete and asphalt, providing strength and stability.

2. Agriculture: Limestone is a valuable source of calcium for soil, helping to neutralize acidity and improve soil health. It also helps to improve the availability of nutrients for plants.

3. Industry: Limestone is used in a variety of industrial processes. It is used to make steel, glass, paper, and chemicals. It is also used in water treatment to remove impurities and adjust pH.

Let me know if you would like to learn more about any of these uses!