The zone which is rich in iron, aluminium, magnesium and clay substances is the?

The zone that is rich in iron, aluminium, magnesium, and clay substances is the "B horizon". The B horizon is the layer of soil beneath the A horizon and above the C horizon. It is also known as the subsoil and is generally composed of a mixture of mineral and organic material. The B horizon is often characterized by an accumulation of clay, which is rich in minerals such as iron, aluminium, and magnesium. These minerals can be important for plant growth and are often used as nutrients in agriculture. The B horizon is an important layer of soil as it can provide support for plant roots and help to retain water in the soil.