The earth is made of many different and distinct layers. The deeper layers are composed of heavier metals; they are hotter, denser and under much greater pressure than the outer limits.
(1) One of the layers is the Oceanic Crust
(2) and another one is the Continental Crust
(3) Beneath is the Upper Mantle
(4) Another layer is the Asthenosphere that exhibits plastic properties.
(5) Beneath is the Lower Mantle
(
6) The Outer Core is underneath; its liquid content with the dynamo effect generated by the rotating of the earth forms the protective magnetic field around it.
(7) And the last layer is the Inner Core
Inside the Earth [This Dynamic Earth, USGS]
then we can read in quran that
65-12 Allah is He Who created seven Firmaments and of the earth a similar number. Through the midst of them (all) descends His Command: that ye may know that Allah has power over all things, and that Allah comprehends, all things in (His) Knowledge.