A hetrogeous mixture!
Simply, homogenues mixture and hetrogeneous mixture are the mixtures whose components are and are not uniformly distributed throughout the mass.
As for mud, its constituents are clay, soil,slit,sands etc. which are allowed to dissolve in water. Here,its constituents can be clearly separated through our naked eyes since they are not uniformly distributed.Owing ,these reasons , mud is considered as hetrogeous mixture.
