What is the evidence that the outer core consists mostly of liquid iron? What is the evidence that the outer core contains elements other than iron?
What will be an ideal response?
The P- and S-wave shadow zones imply a liquid outer core. The evidence that it consists mostly of iron include: 1) iron is the only common element that accounts for the high density of the core; 2) liquid iron is consistent with Earth's magnetic field; 3) iron meteorites may be analogs for Earth's core. The evidence that the outer core contains elements other than iron is based on density measurements. The outer-core density is less than pure iron and probably contains some lighter elements such as oxygen, sulfur, silicon, potassium, or hydrogen.
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What will be an ideal response?
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What will be an ideal response?
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