nnComplete the Two lab writes ups at the bottom of these assignments.nn1.nnSummarize the relationship between accumulation and ablation over the course of a glacier.nnWhat relationship between accumulation and ablation is necessary for glaciers to form? Hownnwilnnl the relationship between accumulation and ablation change bnnetween a glaciernn’nns head andnnits toe? How will it change between winter and summer?nn2.nnCompare and contrast the Nabesna and Athabasca Glaciers. Identifynnand describennthreenndimensions of climate which cause the Nabesna Glacier to extend over a much lannrger distancennthan the Athabasca Glacier. (HINT: remember our framework ofnnclimate controlsnn—nnhownnwill theynnaffect the relationship between accumulation and ablation?)nn3.nnIn our video tour, we contrasted summer and winternn(or, at least, latenn-nnspring)nnviews of thennVictoria and Lefroy glaciers. Although snow accumulates nearly everywhere during the winternnmonths, in onnnly a few areas does this snow endure to form glaciers. What is special about thesennareas of glacial formation?nn4.nnThe glaciers we examined in the Canadian Rockies all end at 6700nn-nn7500nn’nnennlevation. Whynndonnglaciers not extend below this altitude?nn(HINT: What effects will altitude have on thennrelationship between accumulation and ablation?)nn5.nnWhat landforms indicate the previous influencennof glaciationnnin the valleys below the Athabasca,nnVictoria, Lefroy, and Bow Glaciers?nn6.nnWhat elements of the landscape near Geornngetown, Colorado, indicate the presence of glaciersnnin Coloradonn’nns past? How can you tell thatnnthis glaciation took place in the distant past, innncontrast to the relatively recent glacial activity in the Canadian Rockies?nn