The Internal Structure of Earth,What is the internal structure of Earth?

The Internal Structure of Earth

Earth’s internal structure is composed of four main layers: the inner core, outer core, mantle, and crust. The inner core is the innermost layer and is made of solid iron and nickel, which is believed to be the hottest part of the planet, reaching temperatures of up to 5,700°C (10,292°F) (Lehrend, 2020). The outer core is the second layer and is made up of molten iron and nickel and has temperatures of up to 4,000°C (7,232°F). Moving outward, the mantle is the third layer, composed mostly of silicate rocks and minerals, and it has temperatures of up to 3,000°C (5,432°F) (Quigley, 2020). The crust is the fourth and outermost layer and is composed of solid silicate rocks and minerals. At the surface, the temperature of the crust is much lower, ranging from -20°C (-4°F) to 40°C (104°F). The Earth’s internal structure can be divided into the lithosphere, asthenosphere, and mesosphere. The lithosphere is the Earth’s outermost layer and is composed of the crust and uppermost layer of the mantle. It is rigid and rigidly attached to the surface. The asthenosphere is the layer below the lithosphere and is made up of the mantle’s lower layers. It is not as rigid and is able to flow and deform. The mesosphere is the Earth’s innermost layer and is composed of the outer core and inner core. It is the hottest and dense layer of the Earth. (Quigley, 2020). Cont…


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