The Columbian Icefield in the Canadian Rockies is a must visit for a physical geographer. Courtesy of Google Street Views (Links to an external site.), you can walk around, look around, and visit. I would like to you look around. This is the areal photograph view (Links to an external site.). In the Street View, please look to your right (west) and to your left (east). You will see low-lying ridges. Please zoom in like this view (Links to an external site.) to look at the piles of boulders, cobbles, sand and mud. These represent . Fill in the blanks with the best answer. Group of answer choices These lateral moraines represent the maximum height of the zone of accumulation of the Athabasca glacier. These lateral moraines represent a time when the Athabasca Glacier was a bit more extensive. These glacial aretes represent a former level of the glacier, which has then eroded the valley even deeper into its present position. These lateral moraines represent the equilibrium line (or snow line) of the Athabasca glacier.