Earth formed 4.5 billion years ago. since then The inside was slowly cooling down.Although surface and atmospheric temperatures fluctuate over time (and yes, those outside temperatures are warming), the molten interior, the heart of our planet, is constantly cooling.
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That's not a metaphor. The spinning and convection dynamo deep in the Earth is what creates a huge magnetic field. They are invisible structures that scientists believe protect our planet and enable life to thrive. Tectonic and volcanic activities sustain life through stabilization of global temperature and the carbon cycle.
because the interior of the earth is still cold and will continue to do so This means that the inside will eventually harden. and the geological activity will stop. could turn the world into a barren rock similar to Mars or Mercury New research reveals it may happen sooner than thought.
The key could be a mineral at the junction between the Earth's outer nickel iron core and the molten liquid mantle above it. This border mineral is called bridgmanite, and the velocity of the heat-conducting mineral affects the speed at which heat passes through the core and out into the mantle.
The rate determination is not as simple as the conductivity test of bridgemanite in atmospheric environments. Thermal conductivity can vary with pressure and temperature. which is very different in our world
