Final answer:
Glaciers change the landscape as they melt and retreat by grinding down rocks, leaving behind bare rocks, and affecting local ecosystems.
Step-by-step explanation:
One way in which glaciers change the landscape as they melt and retreat is by scratching and grinding down rocks and carrying loads of gravel and boulders from the mountains to the plains.
Glaciers leave imprints on the landscape, and when they melt, they leave behind bare rocks in their retreat.
For example, in Glacier National Park in Montana, many glaciers have been retreating, resulting in the loss of summer meltwaters and affecting local ecosystems.