Which term refers to large, natural streams of fresh water?

The term that refers to large, natural streams of fresh water is "rivers." Rivers are significant bodies of flowing water that typically originate from sources such as springs, lakes, or melting snow and travel towards larger bodies of water like lakes or oceans. They play a crucial role in the ecosystem, providing habitats for various aquatic species and serving as vital water sources for wildlife and human populations.

In contrast, the other options describe smaller bodies of water. Brooks and creeks are generally smaller stream-like bodies of water and are often tributaries to rivers, while ponds are relatively small, enclosed bodies of still water. Therefore, the distinction in size and function clearly identifies rivers as the correct term for large, natural streams of fresh water.