Properties of ice sheets

Check out some of the physical properties of ice from the links in the following paragraphs.

Because ice is less dense than water, the temperature at which ice melts decreases with increased pressure. A lower melting point might affect the potential size that hypothetical former ice sheets located in the earth's temperate zones might attain, since unless temperature within the former ice sheet remained well below freezing, pressurized ice deep in the ice sheet would very likely melt, and limit the ice thickness. On the other hand, if the ice thickness at the centre was too little, there could be no radial flow of ice towards the perimeter, and the glacial interpretation of landforms such as drumlins would fail. Check out this page for interactive calculations of the Pressure and Melting Temperature at the base of an ice sheet for various thicknesses of a hypothetical ice sheet.

Almost all the work that former continental ice sheets are thought to have done upon the landscape, eroding bedrock and forming drift, distributing it over the land, creating landforms such as drumlins and flutings, excavating lake basins and fjords, etc., must ultimately depend upon the gravitational potential energy of the ice in an ice sheet due to its elevation. Because of the potential energy, ice sheets move and abrade the surface rocks underneath. But is the potential energy of a hypothetical former continental ice sheet adequate to accomplish all the work that is involved in excavating deep rock basins in the hardest of rocks?  Go here to interactively estimate the Potential Energy of an ice sheet.

© Copyright 2002 by Douglas E. Cox 
The Creation Concept