File:Watling's Blue Hole (San Salvador Island, Bahamas) 8 (16282078139).jpg
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Summary
[edit]DescriptionWatling's Blue Hole (San Salvador Island, Bahamas) 8 (16282078139).jpg |
Watling's Blue Hole, southwestern San Salvador Island, eastern Bahamas. (photo by Mark Peter) Several categories of karst (dissolutional features in soluble rocks such as limestone) exist on islands in the Bahamas. Common small-scale karst features include phytokarst and solution tubes. Large-scale karst features include flank margin caves, pit caves, banana holes, lake drains, and blue holes. Blue holes are large, water-filled, subcylindrical voids that extend well below sea level. Blue holes can be oceanic or inland (as is the example shown above). Blue hole waters range in salinity from fresh to marine. Multiple plausible mechanisms have been proposed for the origin of blue holes (e.g., see Mylroie & Carew, 2008, p. 31). Reference cited: Mylroie, J.E. & J.L. Carew. 2008. Field Guide to the Geology and Karst Geomorphology of San Salvador Island. 88 pp. |
Date | |
Source | Watling's Blue Hole (San Salvador Island, Bahamas) 8 |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/16282078139. It was reviewed on 2 March 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
2 March 2015
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current | 21:11, 2 March 2015 | 3,008 × 2,000 (2.77 MB) | Jacopo Werther (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D70s |
Exposure time | 1/500 sec (0.002) |
F-number | f/11 |
Date and time of data generation | 09:24, 25 March 2007 |
Lens focal length | 29 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 19:28, 7 February 2015 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 09:24, 25 March 2007 |
Meaning of each component |
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Image compression mode | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 4 APEX (f/4) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire |
DateTime subseconds | 20 |
DateTimeOriginal subseconds | 20 |
DateTimeDigitized subseconds | 20 |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
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White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 43 mm |
Scene capture type | Standard |
Scene control | Low gain up |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Supported Flashpix version | 1 |
Image width | 3,008 px |
Image height | 2,000 px |
Date metadata was last modified | 14:28, 7 February 2015 |