• ES Picture of the Day 06 2020

    From Black Panther@21:1/186 to All on Fri Nov 6 11:00:28 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.


    Dendrites in Amber

    November 06, 2020

    Amber

    Photographer: Mila Zinkova
    Summary Author: Mila Zinkova; Stu Witmer

    Seen above is a microscopic image of a 20 million-year-old Dominican
    amber. Below the two insects, you can see a plant-looking inclusion
    in the lower part of the amber. These are dendrites from the Greek
    word for tree. Common in limestone, dendrites are sometimes
    called pseudofossils[DEL: :DEL] and can be distinguished from
    fossils by the fractal-like perfection of the branching. They’re
    actually deposits of hydrous iron or manganese oxides that form
    when supersaturated solutions of iron or manganese penetrate the
    limestone and are precipitated on exposure to air at the surface. Other
    dendritic formations in nature include frost on a window,
    river basins and in your brain.

    Related EPODs

    Dendrites in Amber Stonerose Eocene Fossil Site Snake Butte
    Laccolith Schöllenen Gorge Big Obsidian Flow Archive -
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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

    --- up 10 weeks, 3 days, 21 hours, 20 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Sun Dec 6 11:00:44 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.


    Archive - Iguazu Falls

    December 05, 2020

    Iguassu Falls

    Every weekend we present a notable item from our archives. This EPOD
    was originally published December 5, 2003.

    Provided by: Fabiano Diniz, Federal University of Parana
    Summary author: Fabiano Diniz

    The Iguazu Falls is one of the widest waterfalls in the world, located
    on the Brazilian/Argentinian border in Iguassu National Park -- an
    untouchable preservation area. This aerial view of these spectacular
    falls was photographed in March of 2003. The Iguazu River is
    approximately 2 miles (3 km) wide at the point of the falls. Hundreds
    of separate cataracts spread across the Iguazu, some of which drop 200
    feet (61 m).


    Related EPODs

    Archive - Iguazu Falls Archive - Doda Fallet EPOD 20th -
    Flash Flood on Cave Creek River Bussento in Southern Italy
    Archive - Muddy Falls Big Creek in the Great Smoky Mountains
    More...

    Hydrology Links

    * Current Sea Surface Temperature
    * NOAA Ocean Explorer Gallery
    * Ocean Color
    * What is hydrology?
    * Tides and Currents
    * Water Resources of the United States
    * World Waterfall Database
    * The USGS Water Science School
    * World Water Database
    * The World’s Water
    * USGS Surface Water Information Pages

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

    https://epod.usra.edu

    --- up 14 weeks, 5 days, 21 hours, 20 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)