A dot density map uses dots to show the number of people living in a certain area.
ratio of land to water in a certain area.
types of resources in a certain area.
type of climate in a certain area.

ratio of land to water in a certain area.

Explanation:

A dot density map is also known as a dot distribution map. In this type of map, the symbol of the dot is used to denote certain features. Every dot is a representation of certain data highlighted in the map. In such maps, the area in which the dots appear in large numbers, the area is said to have a high density of certain features. There are specifically two types of dot-density maps. The first is one-to-one and the second is one-to-many. In a One-to-one dot map, a single dot symbolizes a certain feature. In a One-to-many dot map, a single dot symbolizes more than one feature.

can you explain a little further maybe give multiple choice? ?