Depending on the temperature and the pressure, water changes easily from one state to another. It can appear as a liquid that flows, or a gas that rises into the atmosphere and forms clouds, or as solid to skate on. Water in its liquid state is very abundant on our plant. You will find it in the seas, lakes, and rivers, serving as home to plants, animals, and other organisms. When the sun heats the water in the seas, rivers, or any place where there is humidity, it is converted to water vapor.
Water vapor is so light that it weighs less than air.
For this reason, it can rise to great heights in the atmosphere and form clouds. As it cools, water acquires the solid state, known as ice. Water vapor in the atmosphere condenses and gives rise to rain, or if the temperature is very low, to snow and hail. This process is called sublimation . In the beginning, our planet was formed only by water that covered all of the landmasses.