Task: Class Definition Understanding (ontology: Earth_Environment/SWEET)

Which of the following definitions best describes 'inner core'?

A. The mantle is divided into sections based upon results from seismology. The the concept is the region from 33–410 km (20 to 254 miles). The upper part of the mantle is composed mostly of peridotite, a rock denser than rocks common in the overlying crust. [Wikipedia]
B. The solid the concept was discovered in 1936 by Inge Lehmann and is generally believed to be composed primarily of iron and some nickel.[Wikipedia]
C. Very little is known about the the concept apart from that it appears to be relatively seismically homogeneous. The the concept is under tremendous pressure and therefore has a higher viscosity than the upper mantle.[Wikipedia]
D. the concept is the layer which separates the mantle from the core. D may consist of material from subducted slabs that descended and came to rest at the core-mantle boundary and/or from a new mineral polymorph discovered in perovskite called post-perovskite.[Wikipedia]

Answer: The solid the concept was discovered in 1936 by Inge Lehmann and is generally believed to be composed primarily of iron and some nickel.[Wikipedia]