Subj : ES Picture of the Day 14  2023
To   : All
From : Dan Richter
Date : Tue Feb 14 2023 11:01:06

 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.


 Grotta di Serracozzo Lava Tube

   February 14, 2023

    Emanuele_epod_DSC_4668_124801_resized_20221221_121424136 (003)

    Emanuele_epod_DSC_4684_01_125320_resized_20221221_121423805 (003)

   Photographer:  Emanuele  Nifosi
   Summary Author:  Emanuele Nifosi

   Earlier this winter I went on a trekking excursion on the flanks of
    Mt. Etna to  Serra delle Concazze. Along the way, we stopped at
   the " Grotta di Serracozzo," a  lava tube created during the
    1971 eruption of Etna. This  grotto is 350 m (~1,150 ft) long.
   At the entrance it’s about 3 m (10 ft) wide and 6 m (20 ft) high but
   then narrows the further in you go. The fractured  lava walls of the
   grotto are striking, recalling aligned and symmetrical squares. They’re
   created by  thermal contraction.

   The volcanological guide pointed out that the rock, unlike what it
   might seem, is not wet. Rather, whenever water contacts the surface
   rapid  oxidation occurs that alters the chemical elements contained
   within the rock, making it appear damp. Note that as you can see in the
   bottom photo, light and fresh air enter this grotto through several
   natural chimneys.

   Photo details: Top Photo - Nikon D700 camera; NIKKOR 35-105 lens, 35
   mm; f/5.6; ISO 800; 1 sec. exposure; flash rear + slow (handheld).
   Photo taken on 12 December 2022, h17:08 (UTC +1)

   Bottom Photo - Nikon D700 camera; NIKKOR 35-105 lens, 35 mm; f/4; 1/80
   sec. exposure; ISO 800. Photo taken on 12 December 2022, 5.01 pm,


   Serra delle Concazze, Catania, Sicily, Italy Coordinates: 37.756310,
   15.053764


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   of Salt in Sicily  Opalized Fossil of a Cycad Cone  Radial Stress
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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
     *  MyShake - University of California, Berkeley
     *  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
 
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