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The answer choices that are the sources of energy in Earth's interior are:
1. **Gravitational energy**: Gravitational energy plays a significant role in the Earth's interior. The gravitational force between Earth's layers causes immense pressure and heat, contributing to the energy within the planet.
2. **Convection currents**: Convection currents in the Earth's mantle transfer heat and drive the movement of tectonic plates. This process is a source of energy in the Earth's interior.
3. **Decay of radioactive elements in the core**: Radioactive decay of elements like uranium, thorium, and potassium in the Earth's core releases heat energy, which contributes to the overall energy within the Earth.
These factors, including gravitational energy, convection currents, and radioactive decay, are key sources of energy in the Earth's interior.
