Final answer:
Plucking is a process where a glacier picks up rocks as it flows over the land, and it is an example of erosion. Erosion involves the transportation of rock fragments, heavily influenced by the actions of water and ice, which shape the landscape.
Step-by-step explanation:
When a glacier flows over land and picks up rocks in a process called plucking, this is an example of erosion. Erosion is the process that helps to shape the earth's surface by transporting rock fragments and other materials from one place to another. This can be observed in natural settings such as rivers and mountains, where the combined forces of water and ice, over time, wear down rocks and move sediments. Glaciers, specifically, are powerful agents of erosion as they slide over land, picking up and carrying debris with them, which is eventually left behind when the ice melts or is deposited elsewhere as the glacier advances.