Also the second largest impact structure on Earth, the 1.85 billion years old Sudbury crater in Canada, hosts world-class mineral deposits - in this case nickel-rich minerals that were melted and concentrated by the extreme heating caused by the impact.
The circumference of Earth at the equator is about 24,902 miles (40,075 km), but from pole-to-pole â the meridional circumference â Earth is only 24,860 miles (40,008 km) around. This shape, caused by the flattening at the poles, is called an oblate spheroid.
The Earth's Diameter is 7926.41 miles. The surface area of Earth is (pi x Diameter) = 197.38 million square miles (where pi = 3.14159265358979). However, the Earth only has 57 million square miles of land (that's 36.48 billion acres; there are 640 acres per square mile). However, there are only 12 million square miles (7.68 billion acres) of arable land.