The amount of Cobalt that would be required to cover the earth would be in the tons. Surface of the Earth: 5.1 x 10^8 km^2 Even if one gram of Cobalt covered one square kilometer, this means you would need 5.1 x 10^5 Kg of Cobalt. Taking the surface of the land mass only - 1.48 x 10^8 km^2, you would be required to deliver 1.48 x 10^5 Kg of Cobalt. Roughly 33.6 tons.
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