Question

Give reasons:

Limestone is called the calcareous rock.

Answer 1

Limestone is called a calcareous rock because its main constituent is calcium carbonate (CaCO₃). This calcium carbonate originates mostly from the remains of marine animals and chemical precipitation in water. Thus, limestone has a high content of calcium carbonate, which characterizes it as calcareous rock. It often forms from organic deposits and chemical processes involving calcium carbonate in sedimentary environments.