Why do we believe Earth has an iron core?
A) Samples from deep holes are iron rich.
B) X-ray cameras show a dark, impenetrable mass at the planet's center.
C) The properties of seismic waves match those expected of a region of iron.
D) Astronomers have seen asteroid impacts sinking into the deep interior.
E) Volcanoes erupt nearly pure iron.
Correct Answer:
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