How Waterfalls Change Over Time

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Presentation transcript:

How Waterfalls Change Over Time Lesson 5 – page 6

Lesson Aims 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

Lip Hard Rock Soft Rock Plunge Pool

Processes Hydraulic Action Undercutting Abrasion

Activity – Draw and annotate the sketches 1 4 6 7 2 5 3 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.

Case study Sipi Falls, Uganda What benefits do Sipi Falls bring to local people?

Explain the employment terms: Extension Activity Explain the employment terms: Formal Sector Informal Sector.