The majority of energy generated from within the Earth is from:

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The data provided for this question is incomplete: there are no answer options listed to analyze, only an answer field and the question text.
Given that the supplied answer states Radiogenic heat from the radioactive decay of unstable elements, I can discuss the reasoning behind why radiogenic heat is considered a major contributor to Earth's internal energy, while also noting the limitation caused by the missing options.
First, the Earth’s internal heat budget comprises heat from two broad sources: primordial (leftover heat from planetary formation) and radiogenic heat produced by the decay of long-lived isotopes such as uranium-238, uranium-235, thorium-232, and potassium-40. Over geological timescales, radiogenic heat has become a dominant, though not necessarily sole, contributor to the total heat flow.
Radiogenic heat is generated continuously as unstable elements decay at known rates, releasing heat in the process. Because these elements are abundant in the Earth's crust and mantle, their ongoing decay provides a steady source of heat that helps drive mantle convection, plate tectonics, and related geophysical processes. This makes radiogenic heat a strong candidate for the majority of the energy produced from within the Earth, particularly when compared to a one-off primordial contribution that has already diminished over time.
However, there is some nuance. Some models and measurements suggest that a significant portion of the current heat flow still traces to the dissipation of primordial heat, especially in the deeper mantle, and the exact share from radiogenic versus primordial heat is an active area of research with uncertainties that depend on the geoneutrino measurements, geological sampling, and modeling assumptions. Therefore, while radiogenic heat is widely recognized as a major component of the Earth’s internal heat, declaring it as the absolute majority requires context from specific geophysical models and data.
Because the options are missing, I cannot evaluate which of them would be supported or refuted by the intended curriculum or data source. If options were present, a proper analysis would compare each statement against current geophysics understanding: whether it correctly identifies radiogenic heat as the predominant ongoing energy source, whether it acknowledges the primordial contribution, and whether it avoids overstating certainty about the exact proportion without empirical constraints.
In sum, radiogenic heat is a central, ongoing source of Earth's internal energy due to radioactive decay of unstable isotopes, and many teaching resources present it as the major contributor in many modern models, though the precise share relative to primordial heat remains model-dependent and subject to ongoing research.

ESCI 1012 (001)

The majority of energy generated from within the Earth is from:

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