Aims- 1. To understand the movement of water within the global hydrological cycle.2. Explain how a balance is maintained within the cycle.

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Aims- 1. To understand the movement of water within the global hydrological cycle.2. Explain how a balance is maintained within the cycle.

Surface Water StorageGlobal Hydrological Cycle

Store %Oceans 97.2Glaciers and ice sheets 2.1Lakes, rivers and inland seas

0.6

soil 0.05Atmosphere 0.04rocks 0.01

Aims- 1. to understand the movement of water within the global hydrological cycle.2. Explain how a balance is maintained within the cycle.

From surface water to atmospheric gas– Water begins it’s journey through the atmosphere when it is converted from a liquid to

a gas by solar energy either through the processes of; Evaporation- Change from a liquid to a gas. Transpiration- Occurs when plants lose water to the leaf surfaces and it is evaporated into the

atmosphere. Evaporation and transpiration over land are collectively referred to as

EVAPOTRANSPIRATION. Condensation

– This process takes place on a large scale in the atmosphere and converts invisible gas to masses of water droplets that form visible features such as cloud and fog.

Precipitation– Rainfall, snow and sleet etc. Any form of moisture falling towards the earth’s surface.

Advection– The horizontal movement of air or water.

If precipitation exceeds evapotranspiration, the extra water goes into the soil and the rock storage underground. If the ground is full, the surplus water will run off the surface into streams.

Aims- 1. To understand the movement of water within the global hydrological cycle.2. Explain how a balance is maintained within the cycle.

Explain how a balance is maintained within the hydrological cycle. 10 marks