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Some water has been present since the Earth's formation, having been bound up in the forming earth with the dust and gas. However, a large part of the water present on Earth is thought to have come from water-rich asteroids and comets colliding with the Earth early in its history (during the Hadean Aeon) .
Some water has been present since the Earth's formation, having been bound up in the forming earth with the dust and gas. However, a large part of the water present on Earth is thought to have come from water-rich asteroids and comets colliding with the Earth early in its history (during the Hadean Aeon) .
The Water Cycle
The Water Cycle
The 'Water Cycle' describes how water changes state and moves through the environment, water is not static but changes over time through a variety of processes.
The 'Water Cycle' describes how water changes state and moves through the environment, water is not static but changes over time through a variety of processes.
The diagram below shows an overview of the processes that make up the Water Cycle:-
The diagram below shows an overview of the processes that make up the Water Cycle:-
In the water cycle, there are many examples of water being stored for long periods of time. The diagram below shows how the Earth's water is distributed between the various 'water stores':-
In the water cycle, there are many examples of water being stored for long periods of time. The diagram below shows how the Earth's water is distributed between the various 'water stores':-
As can be seen from this diagram, less than 1% of the water on Earth is easily accessible to living organisms, including Humans and, as such, liquid freshwater is a resource that must be managed very carefully and sustainably.
As can be seen from this diagram, less than 1% of the water on Earth is easily accessible to living organisms, including Humans and, as such, liquid freshwater is a resource that must be managed very carefully and sustainably.
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