ESCI_1012_04

ESCI_1012_04 - Readings:1425 TheBigPicture Movearound...

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1 Planet Earth and Plate Tectonics •Planetary Structure and Plates •Mechanical Layers of Earth Pl t d Pl t Bd i •Plates and Plate Boundaries Readings: 14 25 The Big Picture •P ie ce s of Earth’s surface –Move around – Grind sideways – Collide –S ink into Earth’s hot interior Collisions create mountain ranges, cause tsunami –Less directly, mountain ranges affect weather and climate
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2 Plate Tectonics •U n i f i e d the study of the Earth (geology,
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3 Continental Oceanic Two Types of Crust % Earth’s Surface 29% 71% Average elevation 0.8 km 3.7 km Average density 2700 kg/m 3 3000 kg/m 3 Basalt Granite Average age Areas > 3500 million < 200 million Minnesota gneiss ~3.9 billion years Bimodal topography of the surface of the Earth Surface is divided into highlands (continents) and lowlands (ocean basins) Mt. Everest Marianas Islands Himalayan Mountains Marianas Trench Depth (km) Elevation (km) Challenger Deep
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Why Topography is Bimodal? The principle of isostasy Fig. 2 BTN1, p. 16 Less dense continental crust floats on denser mantle. Continental crust is less dense than oceanic crust.
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This note was uploaded on 01/28/2012 for the course ESCI 1012 taught by Professor Joshfeinbergbrucemoskowitz during the Spring '11 term at Minnesota.

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ESCI_1012_04 - Readings:1425 TheBigPicture Movearound...

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