The ice in glaciers always starts melting from which part: the top suface, the layers in the middle, or the bottom layer?

zbeckabee

Top. Apr 20 06, 1:20 PM

xfacilitatorx

Bottom!!!! Ice behaves like an easily breaking solid until its thickness exceeds about 50 meters (160 ft). The increased pressure on ice deeper than that depth causes the ice to become plastic and flow. The glacial ice is made up of layers of molecules stacked on top of each other, with relatively weak bonds between the layers. When the stress exceeds the inter-layer binding strength, the layers start to slide past each other. Another type of movement is basal gliding. In this process, the whole glacier moves over the terrain on which it sits, lubricated by meltwater. As the pressure increases toward the base of the glacier, the melting point of water decreases, and the ice melts. Friction between ice and rock and geothermal heat from the Earth's interior also contribute to thawing. This type of movement is dominant in temperate glaciers. http://en.wikipedia.org/wiki/Glacier http://en.wikipedia.org/wiki/Glacier Apr 20 06, 1:45 PM

xfacilitatorx

I am not sure how that first line is supposed to read but that is how it is written. Apr 20 06, 1:46 PM

zbeckabee

My apologies. The first answer up there got away from me. I was getting ready to paste a link when I realized I had misunderstood the article...then... mistakenly hit the "reply" button and the rest is history. Again...my apologies. Apr 20 06, 3:05 PM

xfacilitatorx

If I apologized for all my foibles I would run out of keyboard. It is not necessary but well received Zbeck. Apr 21 06, 12:38 AM

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