When many small streams come together, a river forms. A river is moving water that generally moves toward the ocean. Streams and rivers are known as pathways because they flow. A pond is a small body of water surrounded by land. Ponds can be made by man.
Beavers can dam a stream to form a pond.
Water trapped in a low area of land that cannot drain away will form a pond. Some ponds are fed by underground water. A lake is similar to a pond, except that it is larger. Lakes can also be man-made or natural. Lakes do not always stay the same.