1. The Global Hydrological Cycle Draw and describe the Global Hydrological Cycle. Explain how a balance is maintained within the Global Hydrological Cycle.

2. Water as a finite resources 1.4 billion cubic kilometres of water within the planets hydrosphere. 3% is freshwater. 77.2% of this is in cold storage. 22.4% is in groundwater storage. 0.35% in lakes and swamps. 0.01% in rivers and streams.

3. Uneven distribution of water A small amount available for human use and consumption. Usually in the wrong place and the wrong time. From earliest times people have sought to harness and control the rivers.

6. Evaporation: The transfer of water from the sea to the air as water vapour. Condensation: Water vapour (gas) changes back into water (liquid). It forms small droplets which are visible as clouds. Precipitation: Water falls to earth as either liquid (rain) or in a frozen state (snow, hail). Stream / Surface Run Off: Most water returns to the sea in the form of rivers. Evapotranspiration: evaporation of moisture from vegetation Ground water Flow: Some water returns to the sea as groundwater through soil and rocks. Infiltration: The point at which rainfall seeps into soil. Percolation: The seepage of water downwards through rocks. Throughflow: The movement of water downwards through soil back to the sea. Groundwater Zone: Storage area for water which is slowly released back to the sea via springs and rivers. Interception – When precipitation is prevented from falling to the surface by leaves/dense forests. Hydrological Cycle