Assertion: magnetic field | /r/HasProperty | two fields
Facets:
value: with two separate sources
type: OTHER
value: really
type: DEGREE
Source sentences:
text: Earth's magnetic field is really two fields with two separate sources, argues paleomagnetist Kenneth Hoffman of California Polytechnic State University in San Luis Obispo and geochronologist Brad Singer of the University of Wisconsin, Madison, in a paper published in the Sept. 26 issue of the journal Science.