Visual Glossary - core

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core
The innermost part of the earth. The outer core extends from 2500 to 3500 miles below the earth's surface and is liquid metal. The inner core is the central 500 miles and is solid metal. (See also Earthquake ABC)
Cross-section of earth with lithosphere, mantle and core (Image from John Lahr, USGS Open-File Report 99-132)