Pure water is colorless. It often appears blue in ice or in a clear lake or green or brown in a river because it contains or reflects other matter. Water is wet when it is a liquid but scientifically speaking, it is dry when ice or vapor. Rainwater is most often soft water. Well water or water from streams flowing over gypsum, limestone, or dolomite is more likely to be hard.
Water is heavier than air.
Ocean water is salty. There is much more water than land on the earth's surface. A waterfall is water falling from one level to a lower level. Water comes to the earth as rain or snow. Most of it goes back into the air.