• ES Picture of the Day 02 2023

    From Black Panther@21:1/186 to All on Mon Jan 2 11:00:38 2023
    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.


    Radial Stress Fracture

    January 02, 2023


    TomMc_EPOD.RadialFracturedSiltstoneBoulderOnSandstone (002)

    Photographer: Thomas McGuire

    Summary Author: Thomas McGuire

    This image shows unusual fracturing in a boulder in the remote
    Circle Cliffs area of Southern Utah. The boulder is a massive
    (unlayered) siltstone, a sedimentary rock type common on the
    Colorado Plateau. Whether it weathered in place settling on top of
    the white sandstone surface or was moved onto the sandstone surface
    isn’t clear. Soft siltstone would not survive being moved very far.

    Radial fractures are rare. An impact or explosion might create this
    kind of fracture. But I conjecture that this it occurred as the boulder
    came to rest on a relatively hard, flat sandstone surface with a
    protruding point, or on another, smaller boulder.


    Burr Trail, Escalante-Grand Staircase National Monument, Utah
    Coordinates: 37.7902, -111.1534


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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
    * MyShake - University of California, Berkeley
    * 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

    --- up 44 weeks, 20 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Thu Feb 2 11:01:08 2023
    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.


    Biofouling

    February 02, 2023

    Mila_epod_2 (004)

    Mila_epod_3 (005)

    Photographer: Mila Zinkova
    Summary Author: Mila Zinkova

    Biofouling is an accumulation of marine organisms found on the
    underwater parts of vessels, docks, etc. (top photo shows biofouling on
    a shipwrecked hull). On occasion, they can be dangerous to the
    environment. For example, on January 1, 2023, a cruise ship was
    refused permission to dock in Australian ports because it carried a
    deleterious fungus on its hull.

    At about the same time, a small shipwreck was washed out at Ocean
    Beach in San Francisco. It was almost completely covered by biofouling,
    which included a sea anemone, sponges, algae and barnacles. The
    barnacles were still alive since they're able to survive for many
    years without water, as you can see from this video (made of the
    shipwreck). If you look closely, you can them popping out of their
    shells (bottom photo, at top center).


    Ocean Beach, California Coordinates: 32.7495, -117.2470


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

    https://epod.usra.edu

    --- up 48 weeks, 3 days, 21 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Thu Mar 2 11:00:32 2023
    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.


    Kings Canyon, Australia

    March 02, 2023

    IMG_5688-Kings Canyon-Lost City

    Kings Canyon-Garden of Eden

    Photographer: Rick Stankiewicz
    Summary Author: Rick Stankiewicz
    While touring Australia for three months with my wife in 2014, we had
    the good fortune to tour “ The Red Centre” (Northern Territory),
    which is near the geographic center of the Australian Continent. This
    tour included a bus trip from Yulara to Alice Springs as well as a side
    trip to Watarrka National Park. The jewel of this park is Kings
    Canyon, just 35 km (22 mi) from Kings Creek Station.

    If you’re reasonably healthy, you’ll want to plan on the 6 km (3.6 mi)
    Rim Walk but wear sturdy footwear and start early in the morning
    for this trek in order to beat the heat and catch a stunning sunrise.
    Once up on the rim trail, you’ll eventually enter the “ Lost City,”
    a maze of weathered sandstone domes (above at top). The canyon is a
    combination of Mereenie and Carmichael Sandstones, divided by
    shale and mudstone, deposited between 400 and 440 million years
    ago.

    About halfway around the walk you find yourself descending a series of
    wooden stairs into a palm-filled chasm called the “ Garden of Eden.”
    It offers a shaded, cool respite, next to inviting pools of water that
    reflect the south rim wall and the sky above (middle photo). The canyon
    can reach depths of over 100 m (325 ft), so you need to stay on the
    trails and watch your footing. Australia is a magical place, but
    nowhere more so than the Red Centre. Photos taken on May 21, 2014.

    Photo details: Canon XTi camera; Canon 28 to 70mm lens; ISO 200; f/4 to
    10; 1/40 to 1/250 second exposures.

    Kings Canyon, Australia Coordinates: -24.252966, 131.5757208


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    Geography Links

    * Atlapedia Online
    * CountryReports
    * GPS Visualizer
    * Holt Rinehart Winston World Atlas
    * Mapping Our World
    * Perry-Castañeda Library Map Collection
    * Types of Land
    * World Mapper

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

    https://epod.usra.edu

    --- up 1 year, 3 days, 20 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)