The water cycle
Thanks to the water cycle, there is plenty of water in the atmosphere. Because of the sun’s heat the sea (or lake or river) water evaporates. This means it is no longer liquid water, but becomes vapor and keeps rising in the air. Up there it cools down and forms drops of water which mix to some dust and form clouds.
The wind moves those clouds towards the land and the water falls down as rain or snow.
On the earth, it either...
-drains away
-is absorbed by the plants and evaporates through their leaves
-or flows back to the sea by rivers and glaciers.
We can see this phenomenon in the kitchen when cooking:
If we forget to use the haul-off when boiling water, it becomes steam. When the steam reaches the kitchen tiles, it condensates (it forms water drops again).
As you see, the water keeps circulating in the atmosphere and stays clean! So, we just have to get it :)
Thanks to the water cycle, there is plenty of water in the atmosphere. Because of the sun’s heat the sea (or lake or river) water evaporates. This means it is no longer liquid water, but becomes vapor and keeps rising in the air. Up there it cools down and forms drops of water which mix to some dust and form clouds.
The wind moves those clouds towards the land and the water falls down as rain or snow.
On the earth, it either...
-drains away
-is absorbed by the plants and evaporates through their leaves
-or flows back to the sea by rivers and glaciers.
We can see this phenomenon in the kitchen when cooking:
If we forget to use the haul-off when boiling water, it becomes steam. When the steam reaches the kitchen tiles, it condensates (it forms water drops again).
As you see, the water keeps circulating in the atmosphere and stays clean! So, we just have to get it :)