31 QUAL I TÉ GÉOPHYSIQUEAPPLIQUÉE 1 Overview of the different geothermal systems: role of geophysics in exploration and production G. Paixach, H. Traineau, F. Bugarel, E. Lasne and C. Maïlhol 1.1 What is geothermal energy? Geothermal energy is all about tapping into and utilizing the Earth’s internal heat, which comes from two primary sources: the decay of radioactive elements and the residual heat left over from the planet’s formation billions of years ago. Heat is a form of energy associated with the movement of particles within matter. Heat can be transferred in three ways: conduction, convection, and radiation. Heat © EDP Sciences, 2025 DOI: https://doi.org/10.1051/978-2-7598-3752-6.c001
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