Assertion: mantle | /r/HasProperty | at shallower depths
Facets:
value: at
type: DEGREE
value: slightly
type: DEGREE
Source sentences:
text: mantle boundary appears to have distinctly different seismic properties than the mantle at slightly shallower depths; this unusual mantle region just above the core is called D″ ("D double-prime"), a nomenclature introduced over 50 years ago by the geophysicist Keith Bullen.