In geology,<unk>  refers to heat sources within the planet. Strictly speaking,<unk>  necessarily refers to the Earth but the concept may be applied to other planets.<unk>  is technically an adjective (e.g.,<unk>  energy) but in U.S. English the word has attained frequent use as a noun (otherwise expressed as g. heat, g. source, or geotherm).
The planet's internal heat was originally generated during its accretion, due to gravitational binding energy, and since then additional heat has continued to be generated by the radioactive decay of elements such as uranium, thorium, and potassium. The heat flow from the interior to the surface is only 1/20,000 as great as the energy received from the Sun.
Geothermal
Cathartic
Inhalant
Liquid
Plastic
Xenobiotic
Phytochemical
Vertebrate