Teachers are categorized in four main classes in Bangladesh at University level. The ascending rank of teacher is Lecturer, Assistant Professor, Associate Professor and Professor. The initial position Lecturer is generally enrolled as the top student of the class. Master's degree is required for normal university level Lecturer.
Humus soil is soil made up of decayed organic material. Popularly, it refers to soil that is light in texture, dark brown or black in color, and sweet-smelling.
soil is made of 45 % minerals sand clay silt 25 % water 25 % air and 5 % organics soil also includes dirt that is made of materials that plants avoid growing in hence soil a mixture of decayed organic material living organisms and minerals