Explanation:

- Option 1: Glacier

Glaciers are massive, moving bodies of ice. As they advance and recede, they pick up rocks and soil. This material is deposited as moraines, which are accumulations of glacial debris. .

- Option 2: Wind

Wind causes erosion by moving sand and dust. This forms features like dunes, but not moraines.

- Option 3: River water

Rivers cause erosion by carrying sediments. This creates valleys and deltas but doesn't form moraines.

- Option 4: Underground water

Underground water leads to erosion, forming features like caves and sinkholes, not moraines.

Glacial activity is the primary cause of moraine formations, distinguishing it from other types of erosion.