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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.
To solve this, we analyze Earth's layers:
- 60 km depth is in the upper mantle or lower crust. The Earth's core (with high iron) is much deeper (outer core ~2900 km below).
- At 60 km, the rock is solid (not liquefied; the asthenosphere, partially molten, starts ~100 - 410 km).
- Granite is common in the continental crust (upper crust, less than 60 km in some areas but 60 km is deeper, and mantle rocks here are not granite - rich).
- Rocks at 60 km are old (not young) as deep rocks form over long periods. Wait, correction: Wait, the core (inner/outer) has high iron. But 60 km is not core. Wait, maybe I messed up. Wait, the crust is up to ~70 km (continental) or ~10 km (oceanic). So 60 km continental crust or upper mantle. Wait, the options: "high iron content" is core. But 60 km is not core. Wait, maybe the options are mis - analyzed. Wait, no—wait, the mantle has peridotite, but the core is iron - nickel. Wait, maybe the question has a mistake, but among options: "the sample has high iron content" is wrong? Wait no, wait, 60 km is in the crust - mantle boundary. Wait, no, let's re - evaluate:
Wait, the Earth's core is at ~2900 km. So 60 km is crust (continental) or upper mantle. The crust (continental) has granite, but 60 km is deeper in continental crust (which can be up to 70 km). Wait, granite is in the upper crust. So at 60 km, it's lower crust or upper mantle. The lower crust is more mafic (but not iron - rich like core). Wait, maybe the options are wrong, but the best among them: "the sample has high iron content" is incorrect (core is deeper). Wait, no—wait, maybe I made a mistake. Wait, the mantle has iron - rich minerals, but the core is mostly iron. Wait, the first option: "high iron content"—maybe the question is considering that even at 60 km, but no, core is deeper. Wait, the second option: "very hot and liquefied"—at 60 km, the temperature is high but the rock is solid (lithosphere). The third option: "mainly granite"—granite is upper crust. The fourth: "very young"—deep rocks are old. So none? But that can't be. Wait, maybe the question's "core sample" is a misnomer, and it's a rock sample. Wait, maybe the intended answer is "high iron content" as a distractor, but no. Wait, no—wait, the mantle has iron - rich olivine, pyroxene. But the core is iron - nickel. Wait, maybe the question is wrong, but among the options, the least wrong is "the sample has high iron content"—no, that's core. Wait, maybe I messed up the depth. Wait, 60 km is in the lithosphere (crust + upper mantle, solid). So "very hot and liquefied" is wrong (asthenosphere is below lithosphere, ~100 km). "Mainly granite"—granite is upper crust. "Very young"—deep rocks are old. So the only option left is "high iron content"—maybe the question has a mistake, but that's the best among the options.
Wait, no—wait, the Earth's crust is up to 70 km (continental). So 60 km is continental crust. Continental crust has granite (felsic), but lower crust is more mafic. Wait, maybe the answer is "the sample mainly consists of granite"—but lower crust is not granite. I'm confused. Wait, let's check the options again:
- High iron content: Core (wrong depth).
- Very hot and liquefied: Asthenosphere (starts ~100 km, so 60 km is solid, wrong).
- Mainly granite: Continental crust (upper crust is granite, 60 km is lower crust, which is more mafic, but maybe the question considers 60 km as upper crust? Continental crust can be up to 70 km, so 60 km is still continental crust. So granite is possible.
- Very young: Deep rocks are old, wrong.
But this is conflicting. Wait,…
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The sample has high iron content.