Rare Earth Elements is the ninth soundtrack in the Call of Duty: Black Ops II Official Soundtrack, composed by Jack Wall, with a runtime of 03:38.
It is played in Celerium when discovering the Celerium. It is also played in Karma when entering Colossus and whilst searching for Karma on the database. In addition, it is played in Achilles' Veil during the cutscene and as a variant if Harper dies. Moreover, it is played in Judgement Day in the ending of the mission and if Chloe survives and cracks the Celerium worm.