1. in the interior of the earth can be classified as primordial and radiogenic heat. 2. The thermal energy released as a result of spontaneous is called Radiogenic Heat while the internal heat energy accumulated by in a planet during its few million years of evolution is called Primordial heat. 3. There are three processes can transfer heat: and
Primordial heat is the heat lost by the Earth as it continues to cool from its original formation, and this is in contrast to its still actively-produced radiogenic heat.
