“Being polar glaciers, they are often frozen to the rock below. That bond is so strong that basal slip has trouble operating. It is only the pressure from above that causes a thin film of water to form on any loose rocks and other obstacles, and that allows slow movement. Such rocks on the underside of a glacier scrape away and cause the striations on basal rock, but you don’t get much movement. You also don’t get much debris from cold glaciers, or from ice sheets which build up new layers and expand by sideways creep.Glaciers that are full of rock debris are all temperate glaciers, staying near the melting/freezing point. When they melt back, they leave piles of rock and sand detritus which the glacier had been carrying within it.”“So that is all there is to it?” said Erika.“Not quite. Despite the lecturer’s question, there is also a third category, the sub-polar glaciers. The can melt partially at the top surface, and refreeze at levels near the base of the glacier.”“Ah, a sneaky. I just got out of the shower.”Sarah walked into the room then and she looked awesome as always. Her sandy blonde hair was wet and hanging around her face in little ringlets framing her blonde eyes ands pretty face. Her big tits were bobbing under the tight white t-shirt she was wearing, and her tight ass was barely contained by the short athletic shorts she was wearing. It was all Jake could do to tear his eyes away from her jutting nipples and ask, “So where is Anne at we were about to head out?”“She was out of eye shadow and she ran to the drug store real quick to pick it up, she should be back any second,” answered Sarah.Right on cue Anne walked in the door, she was a small girl, barely 5 feet tall with nice full C cup tits and a hard ass and muscular body from the gymnastics she had done in high school. Her skin and hair was dark, with full red lips and dark bottomless eyes. She was also a dynamo in bed and Jake was ready to spend the night home and fuck her every way he could.
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