Results of the new study appear in the June issue of Geophysical Journal International. Scientists currently define Earth's center in two ways: as the mass center of solid Earth or as the mass center of Earth's entire system, which combines solid Earth, ice sheets, oceans and atmosphere. Argus says there is room for improvement in these estimates.. Earth's diameter is about 7,900 miles (12,750 km). The planet's internal structure comprises four layers: a rocky crust on the outside, then a rocky mantle, an outer core made of magma and a.
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The center of the Earth is almost 4,000 miles (6,400 kilometers) beneath our feet. To put that into context, the deepest humans have ever drilled is 7.6 miles (12.2 km) down,.. The Earth's core is broken up into two distinct regions. The inner core is a sphere of solid metal that measures about 2,440 km across. It's believed to be comprised of 80% iron and 20% nickel.
