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  • MIT OpenCourseWare http://ocw.mit.edu

    12.001 Introduction to Geology Spring 2008

    For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms.

    http://ocw.mit.edu http://ocw.mit.edu/terms

  • Zones of solar radiation and atmospheric convection

    W. W. Norton

    Subtropical deserts: Air is dried before it leaves the equator

    Subtropical deserts: Air is dried before it leaves the equator

    Image removed due to copyright restrictions.

  • Desert Weathering is Characterized By:

    • a dominance of physical weathering

    • minimal chemical weathering, consisting mainly of oxidation of mafic minerals

    • formation of desert varnish:desert varnish: a weathering veneer formed of a mixture of clays and smaller amounts of iron and manganese oxides.

  • The rate of sand The rate of sand transported by transported by wind increases wind increases

    exponentially with exponentially with wind speedwind speed

    Sand movement

  • Dust and smog

    Image courtesy of NOAA.

  • Yardangs, Mars

    NASA/JPL

  • Yardangs, Mars

    NASA/JPL

  • JPL/NASA

  • Gobi: Flaming cliffs of Bayanzag

    Roy Chapman Andrews, director of the American Museum of Natural History, explored Mongolia and was the first person to find fossilized dinosaur eggs (Oviraptor), near this site, on July 13, 1933.

    Image removed due to copyright restrictions.

  • Columbia Hills, Mars

    Image courtesy of NASA.

    Zones of solar radiation and atmospheric convection Desert Weathering is Characterized By: Sand movement Dust and smog Yardangs, Mars Yardangs, Mars Fig. 21.16 Gobi: Flaming cliffs of Bayanzag Columbia Hills, Mars

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