December 5 2012 - Too Smart for His Britches

While reviewing the layers of the Earth Israel asks, 'If scientists can't dig farther than 7 miles into Earth, then how do they know there even is a mantle and a core?'
Great question, I reply.  We researched and found that scientists have used seismic waves to sense the mantle and core.  The wavelengths will change when the material it is passing through changes.  There is a change in material at the level they call the mantle, and the depth that they have labeled the core.
Israel looks off to the distance and states...'so basically there could be dinosaurs in the core, breathing fire?' 
Um....I suppose that could be a reason why the waves show a different reading.