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NRowe NRowe
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8 years ago
Earth is relatively a thin shell . Half the mass of the atmosphere is withing 5km (3.1 miles) of the surface, and 90 percent is within (12.4). Twenty km is not very far-about a 10 minutes drive on most interstate highways. By comparison Earth's radius is 6,3963 km (3963).

What percent of the earth's radius is 20 kilometer?
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Educator
8 years ago
Don't you simply take 20 km and divide it by 6396 km, then multiply by 100%?
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