Fill in the Blanks Fill In: Why Earth is HotOnline version Fill in the blank on why Earth's interior is hot by Benjamin D Morgan 1 greater radioactive StillCoolingOff mantle core 3 least heat pressure uranium 2 collisions CompletelyCooledOff frictional floated generates NoLongerGenerates The interior of the Earth is hot due to reasons . First , the Earth is from when it formed . The Earth is not from the heat generated from when the Earth formed . There are reasons that help explain this . First , reason for why the interior of Earth is hot . One reason is that when the Earth was forming occurred between the planetesimals and asteroids and Earth . Whenever Earth was struck by an asteroid or planetesimal from the impact was generated . Another reason is that heat was generated when the Earth was molten ( melted ) . As the iron , nickel , and other dense materials sunk to the , basalt and other materials sunk to the , and granite and other less dense materials to the crust they ran into one another creating friction . Much like putting your hands together and moving them back - and - forth across each other friction causes heat to be generated . The impacts heat today , but they are cooling off from when the heat was generated . The second reason why Earth's interior is hot is because of the core being . The core not only contains iron , but it also contains other items like . This causes the core to release heat . Even today , the core still heat due to this . The final reason why the Earth's interior is hot is because of . This causes the amount of heat to be generated , but it does generate some heat . The deeper into the Earth's interior you go the the pressure . As the pressure increases the temperature increases . This does not cause a huge difference in temperature , but it does increase the temperature .
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