Geophysical evidence shows that the Earth's mantle is convecting. Why is it convecting?
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The Earth's mantle is completely melted, and this causes convection in the solid inner core.
The magnetic field lines from the rotation of the Earth's solid inner core induce torques in the mantle, causing convection.
The Earth is heated deep inside by radioactive decay and other processes, this heating causes the deep rocks to expand and become lower in density than colder rocks above, and these deep rocks then rise while the shallow rocks sink.
The Earth is cooled deep inside by radioactive decay and other processes, this cooling causes the deep rocks to expand and become lower in density than hotter rocks above, and these deep rocks then rise while the shallow rocks sink
The Earth is heated deep inside by radioactive decay and other processes, this heating causes the deep rocks to contract and become higher in density than colder rocks above, and these deep rocks then rise while the shallow rocks sink