What type of map connects points of equal rainfall?

The correct choice is an isohyetal map, which is specifically designed to represent areas that receive equal amounts of rainfall. Isohyets, the lines drawn on these maps, connect points that report the same level of precipitation, enabling a clear visualization of rainfall distribution across a region. This is particularly useful in fields such as meteorology and hydrology, where understanding rainfall patterns is essential for water resource management, agriculture, and climate research.

Topographic maps are concerned with the representation of the Earth's surface’s relief and elevation contours rather than rainfall distribution. Geological maps focus on the types and ages of rocks in a specific area, which does not pertain to rainfall. Choropleth maps use color or shading to represent statistical data, such as population density or economic factors, across predefined areas, but they do not specifically illustrate equal rainfall amounts.