Explain why glaciers are called nature's bulldozer. In your answer, give examples of how land is reshaped by glaciers.

Glaciers are powerful forces of nature. As glaciers move downhill, grinding their way to the sea, they flatten everything in their way. Glaciers even pull small rocks along with them. These rocks scraped and scratch the ground as they are pulled along. The rocks rub against one another and eventually are ground into a fine dust-like powder which is called glacial silt. Moving rocks and soil as they travel, glaciers sculpt the landscape, carving mountain valleys or shaping peaks. It is easy to see why glaciers are considered to be nature's bulldozers.