From a physical point of view, how clouds, snow and rain are produced.

Cloud: Water on the earth evaporates to form water vapor. Once the water vapor is supersaturated, water molecules will gather around the dust (condensation nucleus) in the air, forming water droplets or ice crystals suspended in the air. Water droplets or ice crystals suspended in the air float in the air, even our common clouds. Water droplets or ice crystals scatter sunlight in all directions, which creates the appearance of clouds.

Rain: The water vapor in the sky is liquefied when it is cold, and the water drops are getting bigger and bigger, so the air can't hold back, and when it falls, it becomes rain.

Snow: When the water vapor in the sky meets condensation, it falls as snow.