English: On Easton Glacier, in the North Cascade Mountains of Washington State I helped collect mass balance measurements with the North Cascades Glacier Climate Project to determine the overall health of the glacier. Here we stopped at the top of an icefall where the crevassed ice allowed us to see the annual snow accumulation layers for the past five years. The layers are distinguishable in the image by the dark horizontal banding resulting from the deposition of debris on the glacier's surface during the summer months. Using either a laser to measure the distances between the layers, or a rope with meter stick markings, we can measure the thickness of the layers. By taking many measurements across the glacier we can calculate the overall change in glacier mass from year to year.