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. Streams may empty into lakes. The lake may lose its water and dry up. Lakes, ponds, rivers and streams are fresh water. Rivers empty into the largest body of water, oceans.