ch12_2302 - The Lithosphere and Plate Tectonics The...

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Unformatted text preview: The Lithosphere and Plate Tectonics The Structure of the Earth The Geologic Time Scale Major Relief Features of the Earths Surface Plate Tectonics Continents of the Past The Structure of the Earth the layers of the Earths interior include the crust, mantle, liquid outer core, and solid inner core Figure 12.1, p. 423 The Structure of the Earth Figure 12.1, p. 423 the inner core is solid due to high pressures contains iron and nickel around 3500 km in radius the outer core is molten due to lower pressure The Structure of the Earth the mantle , a rock shell about 2900 km (about 1800 mi) thick seismic waves indicate that mantle rock is ultramafic (peridotite) temperatures in the mantle range from about 2800C (about 5100F) near the core to about 1800C (about 3300F) near the crust Figure 12.1, p. 423 The Structure of the Earth the crust , approximately 8 to 40 km (about 5 to 25 mi) thick formed largely of igneous metamorphic and sedimentary rock the base of the crust is sharply defined where it contacts the mantle ( Moho ) Figure 12.1, p. 423 the solid upper part of the mantle plus the crust is often referred to as the lithosphere beneath it lies the asthenosphere, the layer of soft, plastic rock in the mantle Figure 12.2, p. 424 The Structure of the Earth The Geologic Time Scale all time older than 570 million years (m.y.) before the present all time older than 570 million years (m....
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This note was uploaded on 06/04/2010 for the course GEOG 1F91 taught by Professor Nealpilger during the Fall '10 term at Brock University.

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ch12_2302 - The Lithosphere and Plate Tectonics The...

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