Hydrological System

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• 97% of the worlds water is in the ocean
• 2% held in ice
• 1% is the remaining fresh water we have

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• The hydrological cycle begins with the evaporation of water from the surface of the ocean

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• As the moist air is lifted, it cools and condenses to form clouds

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• Moisture is transported around the world by clouds

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• Water falls back to the surface as precipitation
• This could be rain, sleet or snow

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• Some water may evaporate when it returns to the surface
• Or the water penetrates the surface and becomes groundwater

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• Ground water seeps its way in to the oceans, rivers and streams

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• Or is released back into the atmosphere by transpiration

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• The balance of water that remains on earths surface is run off which empties into lakes, rivers and streams
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