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How did they calculate the radius of the earth's inner core?

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One method I know if is using seismic methods, much like what is used trying to find oil in the ground. They measure the timing on small explosions set off on the surface with a seismograph. There are other methods as well. These links have detailed information. read more

One method I know if is using seismic methods, much like what is used trying to find oil in the ground. They measure the timing on small explosions set off on the surface with a seismograph. read more

The radius of the Earth is identified as a distance R, and is the angle the Earth rotates through during this time interval T. Here is the relationship between your height h, the time interval T, and the radius of the Earth R, where R and h are measured in centimeters, T is measured in seconds, and T/240 is in units of degrees. read more

The Earth's inner core is the Earth's innermost part. It is primarily a solid ball with a radius of about 1,220 kilometres (760 miles), which is about 70% of the Moon's radius. It is composed of an iron–nickel alloy and some other elements. read more

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