Awon itan-ojo-si-ojo je awon itan to se pataki julo, lai se pelu awada, ti o salaye igbesi aye ojoojumo ati awon ijakadi ti agbegbe Afirika kan.. 
Bakanna awon iye táṣẹ́rẹ́ carbon, Ethane, Haiidjìn Onisulfur, Neon, oxygen, phos, ati  Sulfur.. 