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. Welcome to Crust. Earth’s crust is covered with landforms, air and water. After crust, the next layer is Mantle. Current location Crust. Next location Mantle. Crust. Mantle is the layer below the crust. Mantle is very hot. Mantle consists of rocks in molten form. Current location Mantle. Next location Core. 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. Searching for metals. Inner Core. Outer Core. Metals are in solid form. Nickel. Iron. Metals are in molten form. Nickel. Iron. Let’s go back. Sometimes, hot melted rocks called lava come out to the surface of the earth. Such places are called volcanoes.