Calculation shell thickness Earth

The Earth started expanding 180 million years ago. If we assume the Earth wasn't hollow then,
we can calculate the primitive radius. Sum all land area of 4-5 billion years old. If you look at the ocean age map you count all gray and white areas.



Total landarea = 148.940.000 km² + 30.000.000 km² ≈ 180.000.000 km²
Surface sphere = A = 4*pi*R²

R = sqr(A/pi*4)
R = 3784 km
So the radius of the Earth has increased 68% (now 6371km)

Volume V1 = 4/3*pi*3784km³ = 226.956.169.258 km³
Volume V3= 4/3*pi*6378km³ = 1.086.781.292.542 km³
V2 = V3 – V1 = 859.825.123.284 km³ (V2 is virtual volume inside hollow sphere)

V = 4/3*pi*R³

R = (3*V/4*pi)power(1/3) = 5898 km

R = 6378km – 5898km = 480 km