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Besides iron, the core is thought to contain sulphur and:

ANickelite
BNeonate
CNickel
DNitrate
Answer & Solution
Correct answer: C. Nickel
1. The extra metals sank with the iron. 2. One is a common iron partner. 3. That metal is nickel. _Source: OpenStax Astronomy 2e, Chapter 8, Earth as a Planet._
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