Final answer:
The two essential raw materials for making cement are limestone, which provides calcium carbonate, and clay, which supplies aluminum silicates.
Step-by-step explanation:
The two basic raw materials required for making cement are limestone (CaCO₃) and clay (aluminum silicates). Limestone is a source of calcium carbonate, which is a key ingredient in cement composition. The clay provides aluminum silicates which are necessary for the complex chemistry in cement. When these materials are heated in a kiln, they react to form clinker, which is then ground to produce cement.
The two basic raw materials required for making cement are limestone (CaCO₃) and clay (aluminum silicates).