Final answer:
The long scratch marks left by glaciers moving across rock are known as striations. Striations provide evidence of the direction and force of glacier movement.
Step-by-step explanation:
The long scratch marks left behind by glaciers as they move across rock are called striations. These marks are like signatures indicating the direction of the glacier's movement across the landscape. Glaciers are powerful agents of erosion, capable of scratching, grinding down rocks, and transporting material such as gravel and boulders. Other landforms associated with glacial activity include moraines, drumlins, and eskers, each created through different processes and patterns of deposition and erosion by glaciers.