Explanation:Hill:A hill is a landform that rises high above its surroundings.Taller than a hill, it usually has steep slopes and a rounded or sharp peak.Not a source of water.Spring:Spring is a place where water naturally flows from the ground.Many rivers begin as springs, and many people depend on springs for their water supplies.They are a source of water.Pond:A pond is a small area of still, freshwater.It is different from a river or a stream because it does not have moving water.It differs from a lake because it has a small area and is no more than around 1.8m deep.They are a source of water.River:A river is a large natural stream of water that flows overland.Rivers carry freshwater to people, plants, and animals all across Earth.They are a source of water.?Thus, in this list hill is different from the others.