how waterfalls change over time
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How Waterfalls Change Over Time
Lesson 5 – page 6
To learn that waterfalls change over time.
To learn that waterfalls retreat backwards.
To learn that when a waterfall retreats a gorge is formed.
To learn that Sipi falls brings benefits as a tourist attraction.
Key Skill = Communication
Lesson Aims
Hard Rock
Soft Rock
Lip
Plunge Pool
Processes
Undercutting
Abrasion
Hydraulic Action
The hard rock forms a lip.
The waterfall retreats backwards leaving a gorge.
Hard rock overlies soft rock.
Erosion of the plunge pool causes undercutting.
The soft rock is eroded to form a deep plunge pool.
The undercut lip collapses into the plunge pool.
Soft rock beneath the hard rock is more easily eroded.
Activity – Draw and annotate the sketches
1 4 6 7
2 5
3
What benefits do Sipi Falls bring to local people?
Case studySipi Falls, Uganda
Explain the employment terms:
Formal SectorInformal Sector.
Extension Activity
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