What provides information about ground features and terrain variations?

The correct choice is a map, as it provides a visual representation of geographic areas, showing various ground features and terrain variations. Maps typically include details such as elevation, bodies of water, forests, roads, and urban areas, allowing users to understand the landscape and navigate effectively.

Maps use various symbols and scales to convey information about the physical features of the terrain, presenting a comprehensive overview that can assist in planning routes, understanding geographical relationships, and assessing environmental conditions. They can range from topographic maps that emphasize elevation changes to thematic maps that focus on specific features like land use or vegetation.

While radar, charts, and diagrams provide valuable information in different contexts, they do not serve the same purpose as a map in representing ground features. Radar is primarily used for detecting objects and monitoring weather conditions, charts generally relate to navigational aids or statistical data, and diagrams usually illustrate concepts or processes rather than providing a comprehensive view of physical geography.