Question

a scientist collects a core sample from 60 km deep in earth.
which characteristic will she most likely observe in this sample?
○ the sample has high iron content.
○ the sample is very hot and liquefied.
○ the sample mainly consists of granite.
○ the sample is very young.

Explanation:

Earth's crust (up to ~70 km thick) has varying composition; oceanic crust (which extends to ~60 km in some areas) is rich in iron- and magnesium-rich silicates like basalt, giving it high iron content. 60 km depth is still within the solid lithosphere, so the sample is not liquefied. Granite is typical of continental crust (thicker but less iron-rich), and deep crustal samples are not young as crust forms slowly and persists for long periods.

Answer:

The sample has high iron content.