Aims1. To understand the movement of water within the global
hydrological cycle.
2. Explain how a balance is maintained within the cycle.
Complete worksheet tasks
Aims1. To understand the movement of water within the global
hydrological cycle.
2. Explain how a balance is maintained within the cycle.
Global Hydrological Cycle

Surface Water Storage
Store
%
Oceans
97.2
Glaciers and ice sheets
2.1
Lakes, rivers and inland
seas
0.6
soil
0.05
Atmosphere
0.04
rocks
0.01
Aims1. 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 and transpiration over land are collectively referred to as
EVAPOTRANSPIRATION.
Condensation
–

Rainfall, snow and sleet etc. Any form of moisture falling towards the earth’s surface.
Advection
–

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
–

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.
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.
Aims1. 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