From inner to outer what are the four layers of earth?

The first layer is the CRUST
The second layer is the MANTLE
The third layer is the OUTER CORE
The final layer is the INNER CORE
(Scientists have proved for the inner core to be solid)

The Earth consists of four concentric layers: inner core, outer core, mantle and crust. The crust is made up of tectonic plates, which are in constant motion. Earthquakes and volcanoes are most likely to occur at plate boundaries.

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Answer collision and mountain formation;