Earth's inner core
Videos
Earth's inner core is the innermost geologic layer of the planet Earth. It is primarily a solid ball with a radius of about 1,230 km, which is about 20% of Earth's radius or 70% of the Moon's radius.
Heat flow of the inner Earth, according to S.T. Dye and R. Arevalo.
Internal structure of Earth
Videos
The internal structure of Earth is the spatial variation of chemical and physical properties in the solid Earth. The primary structure is a series of layers: Its mechanical structure is of a rigid lit
Earth's inner core
…Earth's inner core is the innermost geologic layer of the planet Earth. It is primarily a solid ball with a radius of about 1,230 km (760 mi), which is about 20% of Earth's radius or 70% of the Moon's…
A photograph of Earth taken by the crew of Apollo 17 in 1972. A processed version became widely known as The Blue Marble.