The flow of energy from the Earth's interior originates from two main sources: the radiogenic and primordial heat respectively. Radiogenic heat is produced by the radioactive decay of isotopes in the mantle, whereas primordial heat is the energy left over since the Earth's formation.
Without using any sensitive scientific equipment, this flow of energy is observable at stress points between the tectonic plates, such as volcanoes. These are ruptures in the crust of the planet through which materials from the interior of the planet are expelled.
Energy flows differently within Earth's interior, depending on the physical properties of the layers. The radiogenic and primordial heat respectively.
Radiogenic heat is produced by the radioactive decay of isotopes in the mantle, whereas primordial heat is the energy left over since the Earth's formation.
In plate tectonics, Earth's outermost layer, or lithosphere made up of the crust and upper mantle is broken into large rocky plates. These plates lie on top of a partially molten layer of rock called the asthenosphere.
Thus, The radiogenic and primordial heat respectively.
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