Geo I

The Earth's Interior:
Way Down Inside

How do we know what is below the Earth's surface? We get clues from

All are helpful, but the best evidence we have comes from analysis of the physical properties of the Earth, which is the realm of Geophysics, and subdisciplines like seismology, potential field geophysics (gravity and magnetics), geoelectricity, and heat flow.

Because rocks are "opaque" we learn deduce all we know by inference, but is this any different from what we have been discussing so far (time vs. space)?