the amount of data concerning the earths internal structure is growing in leaps and bounds. The ability to discern between rock types, water, oil, gas, faults a

the amount of data concerning the earths internal structure is growing in leaps and bounds. The ability to discern between rock types, water, oil, gas, faults and fractures, and molten and semi molten rocks is becoming much more precise. The fun part is that siesmologists use the earths own movements and resulting siesmic and acoustical waves to build the picture, though the scale is intimidating, beyond human capacity to know in any fine detail.Add in ground penetrating radar and experiments useing known explosive charges, placed in precise locations, and the fine resolution just gets better. Bet the whole geology field is having fun.