Navigate to 43.765 N, 110.730 W in Grand Teton National Park, zoom to an eye altitude of 7 km, and examine Jenny Lake, which lies at the eastern mouth of a large valley. Use your cursor to profile the elevation. You will observe that the lake is rimmed on its eastern side by a narrow ridge, green with trees, that rises up to 30 m above the lake surface. Zoom in to 3.5 km, rotate the view to look west, and tilt the view to look up the valley; using the Move joystick, move eastward so you can view the position of the lake relative to the Teton mountain front. Which of the following terms best describes the ridge that encircles Jenny Lake? a. Esker b. Drumlin c. Terminal moraine d. Medial moraine

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