Chalk /ˈtʃɔːk/ is a soft, white, porous sedimentary rock, a form of limestone composed of the mineral calcite. Calcite is calcium carbonate or CaCO3. It forms under reasonably deep marine conditions from the gradual accumulation of minute calcite plates (coccoliths) shed from micro-organisms called coccolithophores.
In a Roman context, ‘son of god’ referred to the emperor of Rome. After Julius Caesar’s death he was deified by the Roman senate and was dubbed Divi Iulius or ‘the divine Julius.’ As such, his adopted successor, Octavian, upon his death and during his lifetime as emperor was called ‘Divi Filius’ or ‘son of god.’ Octavian’s adopted son Tiberius received the same honorary title. Under the Roman Empire, the emperor was literally worshiped as a god. In Jewish contexts, the ‘son of god’ refers to the king of Israel. In 2 Samuel 7:14 God relays that the new king of Israel will be his son and he will become his father.