Which two factors typically characterize areas with vast water sources?

Areas with vast water sources are typically characterized by high runoff and relatively low populations. High runoff occurs in regions where significant rainfall or melting snow generates substantial water flow into rivers, lakes, and oceans. This water abundance can lead to the formation of ecosystems that support a variety of wildlife and plant life, yet these areas might still experience lower population densities.

The presence of extensive water bodies can result in the creation of habitats that favor aquatic life, while also potentially limiting human settlements due to factors such as flooding or difficulties in land access. In many cases, the abundance of water can support agriculture or aquaculture, but the direct population density may remain low due to geographical challenges or the preference of populations to settle in more arable or accessible lands.

In contrast, the other choices do not accurately reflect the typical conditions associated with large water sources. While high biodiversity may exist in some wetland areas, it does not always correlate with the size of the water source. Lower rainfall and high temperatures would generally be characteristic of arid regions, not those with abundant water. Lastly, rich soil and high fertility can be present in fertile floodplains, but these attributes do not solely define areas with vast water sources, as they can also exist in regions with limited water.