Show HEAT INTERIOR energy borne dr rio energy being future store greater discoveries yet magazine energy heat interior source power energy heat interior 13 beyond power already short below surface temperature downward average rate sit depth fifty miles less abundant reason earth hot body thin cold surface essential heat heat beat engine enormous capacity world found near surface ranges possible within level interior heat earth origin remote khan sun own axial worthy serious possible source power able transform heat heat beat energy large scale economy great waste steam engine must soon come 6 form en |