Assertion: terrestrial planet's core | /r/AtLocation | the temperature diagram
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Source sentences:
text: As shown in the temperature diagram and in the wave-velocity diagram, the outer core of the Earth must be a liquid, or given the materials and temperatures involved, a molten material (molten meaning a liquid form of a normally solid material that requires very high temperatures to melt); and the molten outer core of the Earth cannot be made of exactly the same materials as the solid inner core, because the temperature of the Earth must be higher the further down you go (heat only goes from hot places to cold places, and since it comes from inside the Earth and escapes at the surface, the temperature of necessity must increase all the way down, regardless of any details that we wouldn't want to consider in an introductory discussion and although there is a lot covered here, so it may seem complicated, this is actually a very simple discussion compared to what a student majoring in astronomy, geology, planetary geology or geophysics would encounter).