What is the percentage of IRON, in chemical composition of earth?
(a) Approximately 20% – 22%
(b) Approximately 25%-27%
(c) Approximately 40%-42%
(d) Approximately 32%-35%
(a) Approximately 20% – 22%
(b) Approximately 25%-27%
(c) Approximately 40%-42%
(d) Approximately 32%-35%
