• ES Picture of the Day 01 2020

    From Black Panther@21:1/186 to All on Tue Dec 1 11:00:34 2020
    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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    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

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

    https://epod.usra.edu

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