The Source or Sources of the Internal Heat of Earth

question 23

Multiple Choice

The source or sources of the internal heat of Earth are:

• A) tidal stress.
• B) radioactive decay.
• C) leftover heat of planetary formation.
• D) all of the above

---

Definitions:

Hypoglossal

Relating to the twelfth cranial nerve, which is primarily responsible for controlling the muscles of the tongue.

Facial

Pertaining to the face, including structures, muscles, or expressions associated with the human face.

Umami

Umami, one of the five basic tastes, is the savory taste attributed to amino acids such as glutamate, and nucleotides.

Tastant

Substances that can be tasted or detected by the taste receptors, contributing to the sense of taste.