Tlhahlobo ea tertiary ke eng?
Tlhahlobo ea tertiary ke mofuta oa tlhahlobo e shebang litlaleho tsa lichelete tsa k'hamphani ho lekola ts'ebetso ea lichelete ea k'hamphani. E lebisa tlhokomelo ho phaello ea khamphani, phallo ea chelete le boemo ba mokoloto.