Glaciers are massive bodies of ice that move under their own weight. They form when snow accumulates faster than ablation, and this process continues over years and centuries. It's fascinating to see the incredible amount of ice accumulated by the end of the last ice age. Learn about the glaciers in the world and how they affect our environment today. The following are some Glaciers Facts. You'll want to know them all Glaciers have a huge impact on the landscape of the northern U.S. A single trillion-ton ice cube can change the landscape. This massive iceberg has carved out many lakes, and the entire landscape is affected by its movements.