scientific postulation scientific postulation scientific postulation - U. of CO GeoPhysics scientific postulation "The Earth's Inside" layer of Earth 1,000° C scientific postulation scientific postulation solid iron core scientific postulation scientific postulation layer of Earth scientific postulation scientific postulation scientific postulation spewing water colorado.edu the original the original scientific postulation scientific postulation UCo GeoPhys scientific postulation solid iron core colorado.edu - U. of CO GeoPhysics What is the make up of each layer? scientific postulation