Nchekwa nkume bụ nzọụkwụ dị mkpa iji mee na mpaghara nwere nnukwu ihe ize ndụ nke ọdịda okwute, mbuze ala, na oke mmiri ozuzo.Netwọk Rockfall bụ otu ụdị nchebe nkume nke enwere ike iji jide nnukwu iberibe okwute ka ọ ghara ịda n'elu mkpọda wee mebie ndị ọrụ ma ọ bụ ndị nọ nso.Ma n'ezie, ọ bụ ụdị ntupu hexagonal.