Radioactive decay in earth, especially in earth's crust, creates a tremendous amount of heat.
The Earth's core, which lies 2,900 kilometers (1,800 miles) underneath the planet's crust or surface, is where the planet is warmest. The friction and gravitational attraction that was produced when Earth was formed more than 4 billion years ago provide a modest amount of the core's heat.
The continual production of heat on Earth, however, is mostly caused by the decay of radioactive isotopes like potassium-40 and thorium-232.
In the core, radioactive decay is an ongoing process. There, the temperature may reach more than 5,000 °C, or 9,000 °F. Continuous heat radiation from the core warms rocks, water, gas, and other geological components.
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