Earth Part 2 G. Yannakoulias.

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Presentation transcript:

Earth Part 2 G. Yannakoulias

Earth’s Layers

Image of Earth’s Crust

Earth’s Crust Thin layer of solid rock surrounding Earth Thickness of crust varies depending whether oceanic or continental crust Thinner under the oceans—called oceanic crust (10 km) Thicker under the continents—continental crust (40 km) Continental crust—mostly granite rock Oceanic crust—mostly basalt rock

Image of Earth’s Mantle—Upper and Lower Mantle Exist

Upper Mantle Thickness: 660 km Temperatures: 500-1000 degrees Celsium Top part of this layer is solid Top part of solid mantle and crust together make up the lithosphere (Gk. lithos = rock) Lower part of upper mantle is “gooey” like taffy and is responsible for movement of surface plates through convection currents

Lower Mantle Thickness: 2200 km Temperatures: 1000-4000 degrees celsius Mostly solid in texture Made of dense solid rock

Outer Core

Outer Core Composition Liquid layer 2270 km in thickness Made of mostly iron and nickel Responsible for creating the magnetic field of the Earth Temperatures: 4000-5000 degrees Celsius

Inner Core Thickness: 1200 km Temperature: 5000-6000 degrees Celsius Solid in Composition Solid due to high pressures