tag:blogger.com,1999:blog-1228690739485734684.post1996893031352418308..comments2024-03-28T22:13:17.139+00:00Comments on Stonehenge and the Ice Age: On the uphill transport of debris by flowing iceBRIAN JOHNhttp://www.blogger.com/profile/00413447032454568083noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-1228690739485734684.post-14694763029051149812018-04-11T11:15:30.041+01:002018-04-11T11:15:30.041+01:00A Foot together with ankle focus presents Foot med...A Foot together with ankle focus presents Foot medical certification a cutting edge capacity To <br /><br />chicago, IL medical professional. Neal Frankel heightens man or women schooling using the practice's within the tips that are available from a leg Foot web site Centre's. your clientele schools has developed into a top priority along with doctor. 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Actually ice behaves in the same fashion, according to the laws of physics, whether it is in an ice sheet or a glacier. Ice temperature is one crucial factor - if it is above the pressure melting point it will behave as a viscous fluid, with a lot of internal deformation and rearrangement of crustals, and if it is below the pressure melting point it will often be frozen to the bed, and will deform by brittle fracture. Glaciers reorganize themselves internally all the time. (1) So yes, ice can flow a lot more quickly in its upper layers then on its base if circumstances are right. (2) If there is a head-on collision between ice sheets or glaciers, the ice will try to escape sideways, and if that is impossible it will simply build up and movement will effectively be stopped. But it will not bulldoze uphill, leaving a reverse slope on the glacier surface. Glaciers always stick to the basis rule that the surface gradient will be in tune with the overall direction of movement. Where two ice sheets or glaciers come into contact at a glancing angle, as it were, the ice will move at whatever velocity is needed for it to be evacuated -- so it might speed up and there might be a lot of deformation and cravassing in the contact zone as a reflection of this. And yes, there could be increased erosional activity -- quarrying -- beneath that contact zone. That's the sort of idea Lionel Jackson and I explored in our "Earth" article a few years ago. (3) Yes, there is a relationship between glacier velocity and erosional effects -- warm-based or sliding glaciers (or polythermal ones, where some ice is warm-based and some is cold-based) are much more capable of eroding and entraining rock than cold-based glaciers that are frozen to their beds. I have seen a couple of glaciers in the Arctic that are almost free of debris!BRIAN JOHNhttps://www.blogger.com/profile/00413447032454568083noreply@blogger.comtag:blogger.com,1999:blog-1228690739485734684.post-81186258905818345832017-01-03T09:37:55.016+00:002017-01-03T09:37:55.016+00:00Some questions about ice flow:
1. Can there be a ...Some questions about ice flow:<br /><br />1. Can there be a difference in the flow of ice between the upper and lower portions of a glacier at one point, meaining could there be a stationary or slow moving element in a trough, with a fast moving component above it? Or does it depend on the type of ice?<br /><br />2. When two ice sheets come into conflict, does the flow become rejuventated and speed up? Thinking here about the Irish Sea ice meeting the Welsh ice sheet, resulting in a change in direction, speed and agression on the underlying deposits.<br /><br />3. Does the speed of the ice sheet affect the agression on obstacles? Does a slow but sure movement cause more impact than a faster one?<br /><br />I think I may be confusing ice sheet with glacier.<br /><br />DaveDave Maynardhttps://www.blogger.com/profile/14162915474983638825noreply@blogger.com