Mechanical layers of the earth

the Mechanical layers of the Earth

Distinct Layers
* Compositional Layers
* Mechanical Layers
Compositional Layers is composed of Crust, Mantle and Core while Mechanical Layers is composed of Lithosphere, Asthenosphere, Mesosphere, Outer Core and Inner Core.
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1. Mechanical Layers of The Earth

2. Distinct Layers Compositional Layers Mechanical Layers Crust Mantle Core Lithosphere Asthenosphere Mesosphere Outer Core Inner Core

3. Compositional Layers

4. Crust 2 types of Crust: Continental Crust Oceanic Crust 90 km. thick (12~56 miles) Density of 2.7 g/cm³ = it is made up of all rock types 1 0 km. thick (3~6 miles) Density of 3g/cm³ = it is made of more dense rocks Ocean Land Oceanic Crust Continental Crust

5. Mantle Convection Currents Upper Mantle Middle Mantle Lower Mantle 2,885 km. thick (1,800 miles) Density of 3.5g/cm³ to 5.5g/cm³ 70% = The hot material (magma) in the mantle rises to the top of the mantle, cools, then sinks, reheats, and rises again. These convection currents cause changes in the Earth’s surface

6. CORE Core Made mostly of iron Liquid – Outer core Solid – Inner Core 1/3 of the earth’s mass Very hot. Outer boundary of the core is a depth of 2,900 km. Two parts Outer Core Inner Core

7. Mechanical Layers

8. Lithosphere Inner Core Solid Outer Core Liquid Lithosphere – Crust and Upper Layer of the Mantle Mantle Crust It is rigid This layer extends down from the surface about 100-150km .

9. Lithosphere The lithosphere (crust and upper mantle) is divided into separate plates which move very slowly in response to the “ convecting ” part of the mantle.

10. Asthenosphere Inner Core Solid Outer Core Liquid Crust Mantle Layer of the Mantle (asthenosphere) that consists of hot rock of tar-like consistency, which slowly moves

11. Asthenosphere

12. Mesosphere The solid part of the earth’s mantle lying between the asthenosphere and the core. It is made of magma (hot, pressurized molten rock) Density between 3.4 and 4. 3g/cm³ Lower Mantle

13. Outer Core Outer Core 2,255 km. thick (1,400 miles) Composed of melted metals nickel and iron. Molten (liquid) metal that is about 4,700°C (8,500°F ) = Earth’s magnetism is created because the outer core moves around the inner core.

14. Inner Core Inner Core 1,220 km. thick (758 miles) Solid sphere composed mostly of iron. It is believed to be as hot as 6,650°C (12,000°F ) It is solid because of the pressure from the outer core, mantle, and crust compressing it tremendously

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