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Which layer of the Earth is the most dense?
Answer 1:

The Earth is density stratified. This means starting at the surface and traveling deeper and deeper, the density of the stuff increases.

The densest stuff has a density of about 12 grams/ cubic centimeter. Liquid water, for comparison has a density of 1 gram per cubic centimeter.

The highest density occurs at the center of the earth and is solid iron. Actually it is an alloy of about 90% iron (Fe) and 10 % nickel (Ni)


Answer 2:

The inner core, which is believed to be comprised of mostly iron and nickel, is the most dense layer of the Earth.


Answer 3:

The core is the most dense part (which is why it's in the center; it sinks relative to everything else). The Earth's core is made of what is probably an iron-nickel alloy with a density of around eleven times that of water.



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