Website review: Blue Ice--An Illustrated Guide to a...
Teiresias discovered this in Hiking
•1 reviews since Mar 11, 2008
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•carleton.edu/departments/geol/Links/AlumContr...
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Teiresias discovered 4 months ago- Blue Ice An Illustrated Guide to a Glacier Some men found a hole in the side of the mountain. "This is Thunderbird's home. This is a supernatural place." Whenever they walked close to the hole they were very afraid. Thunderbird smelled the hunters whenever they approached his place. He did not want any person to come near his house. He caused ice to come out of the door of his house. Whenever people came near there, he rolled ice down the mountainside while he made the thunder noise. The ice would roll until it came to the level place where the rocks are. There it broke into a million pieces, and rattled as it rolled farther down the valley. Everyone was afraid of Thunderbird and of the thunder noise. No one would sleep near that place over night. Glaciers are inescapable. Farmers throughout the world plow around vehicle-sized stones left behind by retreating glaciers in the middle of perfectly flat fields. In recent geologic time, glaciers have scoured 30% of the Earth's land surface including much of North America. Currently, glaciers hold more than 75% of the planet's fresh water supply; Florida, and other low-lying coastal areas, would be flooded by a rise in sea level if all the world's glaciers were to suddenly melt. Blue glacier is a valley glacier--it carries snow and ice that accumulates on Mount Olympus down a valley to a lower elevation where it then melts. This glacier follows a pre-existing stream valley and is confined by slopes on either side. Most valley glaciers are temperate or warm glaciers, meaning that the ice is at or near the melting point. Glaciers can also take the form of an ice sheet or cap such as in Antarctica. Most of the Antarctic ice cap is a cold polar glacier where the temperature is well below the melting point. Snow is white because full spectrum, or white, light is scattered and reflected at the boundary between ice and air. Ice only appears blue when it is sufficiently consolidated that bubbles do not interfere with the passage of light. Without the scattering effect of air bubbles, light can penetrate ice undisturbed. In ice, the absorption of light at the red end of the spectrum is six times greater than at the blue end. Thus the deeper light energy travels, the more photons from the red end of the spectrum it loses along the way. Two meters into the glacier, most of the reds are dead. A lack of reflected red wavelengths produces the color blue in the human eye. Full Story
