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The decay of radioactive elements creates heat, and the decay of certain radioactive elements can take billions of years. Additionally, the heat in Earth's interior is partially created by compressional forces and friction between the particles that make up the Earth. This heat is insulated, depending on depth, by thousands of miles of overlying material which makes it difficult for the heat to escape to the surface. As the radioactive isotopes gradually decrease in number, and the heat gradually escapes to space, Earth is gradually becoming cooler. Because these processes take billions of years, their effects go unnoticed due to small organism lifespans.

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Q: Why is the earth still so hot inside if it is over 4 billion years old?
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Our mother earth can be around for more than billion of years. She have been around for more than 4.5 billion years and she is still here.


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