i watched how the earth was made: https://www.youtube.com/watch?v=8lNeU8ezo94#t=18
One thing seldom mentioned is the general (very) long term trend of a cooling core and diminishing volcanism and tectonic activity.
No OMG!OMG!OMG! histrionics, not meant for the LIV 'Dancing' crowd.
Just a rational, calmly presented, informative presentation of geologic principles w/great videography.