The average radius of Earth is 6,371 km. If the average thickness of oceanic crust is 7.5 km and the average thickness of continental crust is 35 km, what fraction of Earth's radius is each type of crust? Convert the values from the km to the mile

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adioabiola adioabiola · Answer 1 · 2021-09-24T14:11:55+02:00

We are required to find the fraction of Earth radius is each type of crust

The fraction of Earth's radius which is oceanic crust = 0.00118

The fraction of Earth's radius which is continental crust = 0.0055

Since 1km = 0.621 miles

Average radius of Earth = 6,371 km

i.e 6,371 × 0.621miles = 3958.76miles

Average thickness of oceanic crust = 7.5 km

i.e 7.5 × 0.621 miles = 4.66miles

Average thickness of continental crust = 35 km

i.e 35 × 0.621 miles = 21.75miles

Therefore, the fraction of Earth's radius which is oceanic crust = 4.66 / 3958.76

= 233/197938 = 0.00118

Therefore, the fraction of Earth's radius which is continental crust = 21.75 / 3958.76

= 0.0055

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