Assertion: mantle | /r/HasAspect | several layers
Facets:
value: based on seismologic properties
type: OTHER
Source sentences:
text: The mantle is divided into several layers: the upper mantle, the transition zone, the lower mantle, and D” (D double-prime), the strange region where the mantle meets the outer core
text: The mantle is about 1,800 miles (2,900 kilometers) thick and appears to be divided into two layers: the upper mantle and the lower mantle.
text: The mantle is also divided into several layers, based on seismologic properties.