6. Look carefully at diagram E. a) What is a drainage basin? b) Make your own copy of diagram E and label the water sources, mountain tributaries, main river, confluence and watershed.

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The key terms are defined below.

Term	Definition
Precipitation	Water falling from clouds as rain, snow or hail.
Evaporation	The change of liquid water into water vapour caused by heating.
Condensation	The change of water vapour into tiny liquid-water droplets when it cools.
Infiltration	The movement of water down into the soil.
Surface run-off	Water flowing over the land surface towards a river, lake or sea.
Groundwater	Water stored or moving below the ground in soil and rocks.
Tributary	A smaller river or stream that flows into a larger river.
Confluence	The place where two rivers or streams meet.
Drainage basin	The area of land drained by a river and its tributaries.
Watershed	High land forming the boundary between two drainage basins.

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