..."core" could refer to any number of things...
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Africa Morocco, Malawi,is the most stable continent on the planet.There was no core to the supercontinent of Pangea.
plasma is most common in the universe outside of earth plasma is the most common state of matter
You can find the most Iron and nickel in the earth's inner and outer core.
The Earth's core.
RuBisCO is the most common protein on Earth. This protein is an enzyme.