The orderly movement of a neuroblast from one site to another, often during the development of a multicellular organism or multicellular structure. A neuroblast is any cell that will divide and give rise to a neuron. [ http://purl.obolibrary.org/obo/CL_0000031 http://www.ncbi.nlm.nih.gov/pubmed/15543145 GOC:jc ]