GENERAL GEOLOGY

Detailed explanation-1: -The densest layer (inner core) is at the center and the least dense layer (crust) is the outermost layer. The atmosphere, composed of gases, can technically be considered a layer as well and is obviously lighter than the crust.

Detailed explanation-2: -Earth’s interior layers are ordered by density. The densest layer is the solid metal inner core, the mantle is of intermediate density, and the least dense layer is the lithosphere, particularly the continental lithosphere. The origin of these layers and how scientists know about them is fascinating.

Detailed explanation-3: -The inner core is believed to be composed of an iron–nickel alloy with some other elements. The temperature at the inner core’s surface is estimated to be approximately 5, 700 K (5, 430 °C; 9, 800 °F), which is about the temperature at the surface of the Sun.

Detailed explanation-4: -At the center of the Earth lies the core, which is nearly twice as dense as the mantle because its composition is metallic (iron-nickel alloy) rather than stony.

Detailed explanation-5: -Earth density by core, mantle, and crust But if you compare Earth density by its layers, density steadily increases as you go inwards from the crust to core. INNER CORE: Earth’s inner core has the highest density at 12.9 g/cm3.