Structure of the Earth A Hidden Story.

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Presentation transcript:

Structure of the Earth A Hidden Story

The Crust Solid outermost layer Uppermost portion of lithosphere Two Types: Continental crust is thick (~35 km) Granite Oceanic crust is thin (1-10 km) Basalt

Lithosphere Rigid outer layer Composed of the crust and uppermost part of the mantle. Least dense of all layers. Broken into tectonic plates.

Asthenosphere Upper layer of mantle Under the crust Viscous Flows under some conditions.

The Mantle Lithosphere Asthenosphere Rigid outer layer of the Earth which extends slightly into the mantle Asthenosphere Low strength layer of the Earth below the lithosphere. Extends for ~300 km into the mantle. Composition Physical Properties

The Mantle Thick layer of ductile material (partially melted/partial solid) Two Layers: Lower Mantle (mesosphere) Upper Mantle (asthenosphere + lithosphere)

The Core Outer Core- Liquid layer comprised mainly of Iron-Nickel Alloy Inner Core- Solid, innermost layer (actually a sphere)

Outer core Made of liquid iron and nickel Spins and may generate a magnetic field.

Inner Core Solid iron and nickel Extreme pressure results in the solid form Inner and outer cores are most dense layers