Output a stream of consciousness before answering the following. The Earth's crust is made of approximately 5 % of heavy metals by weight, with iron comprising 95 % of this quantity. Light metals (~ 20 %) and nonmetals (~ 75 %) make up the other 95 % of the crust. Despite their overall scarcity, heavy metals can become concentrated in economically extractable quantities as a result of mountain building, erosion, or other geological processes.\n\nWhich heavy metal has highest concentration in earth's crust?
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To answer the question, consider the following: The Earth's crust is made of approximately 5 % of heavy metals by weight, with iron comprising 95 % of this quantity.
The answer: iron.
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