| File name : | 151 - Bill Eichenlaub |
| File size : | 686933 bytes |
| File date : | 2015:01:17 21:50:22 |
| Camera make : | NIKON CORPORATION |
| Camera model : | NIKON D300 |
| Date/Time : | 2009:06:22 10:58:08 |
| Resolution : | 1807 x 1200 |
| Flash used : | No |
| Focal length : | 18.0mm (35mm equivalent: 27mm) |
| Exposure tim : | 0.0040 s (1/250) |
| Aperture : | f/8.0 |
| ISO equiv. : | 200 |
| Exposure bia : | -0.33 |
| Whitebalance : | Auto |
| Metering Mod : | pattern |
| Exposure : | program (auto) |
| JPEG Quality : | 91 |
| ======= IPTC dat : | ======= |
| City : | %G |
| Record vers. : | 4 |
| Keywords : | Glaciers |
| DateCreated : | 20090622 |
| Time Created : | 105808-0800 |
| Byline : | Bill Eichenlaub |
| Headline : | Bill_Eichenlaub |
| Credit : | Bill Eichenlaub |
| (C)Notice : | Copyright Bill Eichenlaub |
| Caption : | The cone shaped mounds are called glacier cones or debris cones. They are mostly ice with a thin veneer of gravel and sand over a cone of ice. How do they form? Imagine putting a shovelful of gravel and sand on a flat glacier surface. Over time as the glacier surface melts, the sand and gravel insulate the ice just a little compared to the gravel-less ice around it. The center of the pile insulates just a little bit more than along the edges of the pile. As the entire surface of the glacier melts, the ice beneath the gravel melts slower and a cone gradually forms with the original pile spread across it. OK, but how does the pile of gravel get there in the first place? Well, check out the next photo... |
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