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Q. What is the amount of Iron in Earth (percentage in total mass)?
Answer: 34.6%
Notes: The iron makes up about 34.6% of Earth's mass and 5.2% of Earth's crust. The other metals there are aluminium, silicon etc. The abundant metal Iron is truly one of Earth's essential building blocks.

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Question Number: 10 in Geology Geological Time Earths Internal Structure in above course in App.