Heat from the interior is the cause of plate tectonics and its associated results such as volcanism, trenches, and mountains building.
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The main sources of Earth's internal heat are primordial heat left over from its formation, heat from radioactive decay of elements like uranium and thorium, and heat generated from ongoing geological processes like mantle convection and plate tectonics.
The heat comes in the part were the core was and it melts
The Earth's inner core and outer core interact through the process of convection. Heat from the inner core causes the outer core to heat up and become less dense, leading to the movement of molten iron and nickel in a circular pattern. This convection motion generates the Earth's magnetic field.
Heat rising from within the Earth causes the tectonic plates to move. This movement can result in earthquakes, volcanic activity, and the formation of mountains.
As you move closer to the Earth's inner core, the temperature increases. This is because the inner core is surrounded by layers of molten metal and rock, which generate heat through radioactive decay and residual heat from Earth's formation. The temperature at the Earth's inner core can reach up to around 5700°C (10,300°F).
Heat from the Earth's core.