Here's why:
* Calcium carbonate (CaCO3) is the primary component of limestone, and calcareous soils are formed from the weathering of limestone.
* Calcareous soils often have a high pH (alkaline), as calcium carbonate is a base.
* The presence of calcium carbonate can influence the soil's fertility and suitability for certain plants.
Let me know if you'd like to know more about calcareous soils!