Earth’s inner core is

a.

a dense ball of solid metal.
b.

a layer of molten metal.
c.

a layer of hot rock.
d.

a layer of rock that forms earth’s outer skin.

The correct answer is A. Dense ball of solid metal.

Explanation

The inner core is the deepest layer of the Earth. It is a huge ball of solid iron (slightly larger than Pluto) surrounded by an outer core in a liquid state. The scientific community had raised many estimates about when this internal nucleus formed from 500 million and 2,000 million years ago. Now, a research carried out by scientists from the University of Liverpool (United Kingdom) has determined that the nucleus formed between 1,000 - 1,500 million years ago, which means that the Earth existed about 3,000 years without this solid sphere. So, the correct answer is A. Dense ball of solid metal.

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explanation:

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c

explanation: