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Earth's outer core - Wikipedia
Core
The Outer Core: The Earth’s Swirling Cauldron - ZME Science
Earth's outer core may hold a hidden 'doughnut' | Live Science
Earth's Outer Core - Universe Today
Layers of the Earth - Science Notes and Projects
Outer Core Composition | Overview & Characteristics - Lesson
Internal structure of Earth - Wikipedia
Earth Structure - Education
Inside the Earth [This Dynamic Earth, USGS] - USGS Publications …