 EPOD - a service of USRA

The Earth Science Picture of the Day (EPOD) highlights the diverse processes
and phenomena which shape our planet and our lives. EPOD will collect and
archive photos, imagery, graphics, and artwork with short explanatory
captions and links exemplifying features within the Earth system. The
community is invited to contribute digital imagery, short captions and
relevant links.


 Friction Beats Gravity, For Now

   December 01, 2020

    3 b Rocks

    Single

   Photographer:  Stan Wagon
   Summary Authors:  Stan Wagon

   South-central Utah is known for its striking  sandstone  hoodoos,
   with the most famous ones consisting of  Entrada Sandstone capped by
    Dakota Sandstone. The angular towers seen here are unusual in that
   they consist entirely of  Navajo Sandstone. These three, including
   the one that's very delicately balanced (far right and below) were
   formed when  differential erosion occurred at irregular rates due to
   variability of content and hardness in the various strata; the more
   resistant rock remains when softer material is removed. Photos taken
   October 21, 2020.

   Photo Details: Camera: Sony A6500 digital SLR; E 16-70 lens. Top -
   1/400 sec, ƒ/10 aperture, ISO 160 focal length 20 mm (29 mm at
   traditional full-frame 35 mm camera). Bottom - 1/640 sec., ƒ/10
   aperture, ISO 250 19mm (28 mm at full frame 35 mm camera).

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    More...

Geology Links

     *  Earthquakes
     *  Geologic Time
     *  Geomagnetism
     *  General Dictionary of Geology
     *  Mineral and Locality Database
     *  Mohs Scale of Mineral Hardness
     *  This Dynamic Earth
     *  USGS
     *  USGS Ask a Geologist
     *  USGS/NPS Geologic Glossary
     *  USGS Volcano Hazards Program

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   Earth Science Picture of the Day is a service of the  Universities
   Space Research Association.

https://epod.usra.edu
 
