Layers of Earth. Many years ago, when Earth was formed, it was very hot. Rains and thunderstorms cooled the outer portion and different life forms started originating on the earth. The outer cool layer on which we live is called Crust. Earth's crust is covered with landforms, air and water. After crust, the next layer is Mantle. Mantle is the layer below the crust. Mantle is very hot. Mantle consists of rocks in molten form. The Core is located just below the Mantle. Core is divided into two parts, outer core and inner core. The outer core is in liquid state. The inner core is in solid state.