13. earth's surface area is 5.1 x 10^8 km², its crust has an average thickness of 35 km and an average density of 2.8 g/cm'. the two rarest (non-radioactive) elements in the crust are ruthenium and rhodium, each with an abundance of 1.0 x 10g/metric ton crust. what is the total mass of these two elements in the earth's crust? (1g = 1 x 10 metric ton)
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13. earth's surface area is 5.1 x 10^8 km², its crust has an average thickness of 35 km and an avera...
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