GEOLOGY

Detailed explanation-1: -Earth’s atmosphere has five major and several secondary layers. From lowest to highest, the major layers are the troposphere, stratosphere, mesosphere, thermosphere and exosphere .

Detailed explanation-2: -Crust, mantle, core, lithosphere, asthenosphere, mesosphere, outer core, inner core.

Detailed explanation-3: -Each layer has a unique density (density = mass/volume). Scientists believe that all planets formed on the basis of gravity. Therefore, the layering of Earth is a result of gravitational pull. The densest layer (inner core) is at the center and the least dense layer (crust) is the outermost layer.

Detailed explanation-4: -Lithosphere – rigid and solid earth. Asthenosphere – plastic; made of molten rock. Mesosphere – Lower mantle, transitions to the liquid outer core. Outer Core – made of dense, molten iron and nickel. Inner Core – made of solid iron and nickel.