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The Earth has a layered structure, including the core,
mantle and crust. The crust and upper mantle are cracked
into large pieces called tectonic plates. These plates move
slowly, but can cause earthquakes and volcanoes where they
meet.
The Earth's atmosphere has changed over billions of years,
but for the…

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3. outer core - made from liquid nickel and iron
4. inner core - made from solid nickel and iron

Note that the radius of the core is just over half the radius of
the Earth. The core itself consists of a solid inner core and a
liquid outer core.

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