ESS15_LEC3F10_Bathymetry_2perpage

ESS15_LEC3F10_Bathymetry_2perpage - 9/28/10 Introduction to...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
9/28/10 1 Introduction to Oceanography • Lecture 3: The shape of the ocean floor Plumbago, wikimedia commons, C C A S-A 3.0 Announcements Attend Your Lab Section! TA’s have PTE#’s NASA image, Public Domain
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
9/28/10 2 Basic Structure of the Earth • Layers of increasing density – Thin Crust 2.5 to 3.0 gm/cm 3 – Rocky mantle 3.2 to > 5 gm/cm 3 Metallic core >10 gm/cm 3 Planetary Radius: 6371 km Core Mantle Figure E. Schauble 6371 km Crust 5-70 km Compositional Layers of Earth Hand samples: Granite (cont’l. crust), Basalt (ocean crust), peridotite (mantle), iron meteorite (core) • Thin crustal surface layer (almost all we see) Oceanic (basalt) ~8 km thick Continental (granite) ~35 km thick • Mantle (silicate rock) – Bulk of planet’s volume ~ 2900 km thick • Core – Iron-rich inner part of the planet Core Figure E. Schauble Crust 5-70 km
Background image of page 2
9/28/10 3 Mechanical Layers of Earth Lithosphere Top ~100km Cold and strong Includes crust, part of mantle Asthenosphere Beneath lithosphere Hot and plastic Rigid on short timescales, flows on long timescales Michael Pidwirny, Physical Geography Fundamentals e- Book, Fig. 10h Layering of mechanical strength USGS, Public Domain STRONG, SOLID WEAK, SOLID STRONGER, SOLID WEAK, LIQUID ?, SOLID Lithosphere
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
9/28/10 4 So the Mantle Isn’t Melted? NO! It’s solid, except in a few places (see plate tectonics). Solid lithosphere Solid asthenosphere Partly-melted mantle Mid-ocean ridge volcanoes ! 100 km USGS, Presumed Public Domain Convection in the Mantle • Mantle convection removes heat from Earth’s interior • Occurs on 100 million year timescales • How do we know this? Seismic tomography Image from NASA, presumed Public Domain, http://idlastro.gsfc.nasa.gov/idl_html_help/ Calculating_Image_Statistics.html
Background image of page 4
9/28/10 5 QUESTIONS? http://www.gps.caltech.edu/~gurnis/Movies/movies-more.html Gurnis research group, Caltech, http://www.gps.caltech.edu/ ~gurnis/Movies/ Dynamic_Int_EI/qt-movies.html. The Big Picture: Continents vs. Ocean Basins Plumbago, wikimedia commons, C C A S-A 3.0
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
9/28/10 6 The Big Picture: Bimodal Distribution -10000 -8000 -6000 -4000 -2000 0 2000 4000 6000 8000 10000 0 0.01 0.02 0.03 0.04 0.05 Elevation (meters) Fraction of Earth's surface area Histogram of elevations on Earth Ocean Land Figure E. Schauble based on ETOPO5 data (NOAA), as sampled by S.L. Goldstein and S.
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/01/2010 for the course GEOG ESS15 taught by Professor Aurnou during the Fall '10 term at UCLA.

Page1 / 19

ESS15_LEC3F10_Bathymetry_2perpage - 9/28/10 Introduction to...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online