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Lesson 8 – page 7. To learn what a meander is. To learn how meanders form. To learn how an ox-bow lake forms. Key Skill = Communication.

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Presentation on theme: "Lesson 8 – page 7. To learn what a meander is. To learn how meanders form. To learn how an ox-bow lake forms. Key Skill = Communication."— Presentation transcript:

1 Lesson 8 – page 7

2 To learn what a meander is. To learn how meanders form. To learn how an ox-bow lake forms. Key Skill = Communication

3 Water flows faster on the outside of bends. Abrasion and hydraulic action causes erosion. This causes undercutting of the bank. This causes a steep river cliff.

4 Water flows slower on the inside of bends. The river deposits its load. This results in a gentle bank of sand and gravel. This is called a point bar.

5 Point Bar River Cliff

6 River Taff - Cilfynydd River Cliff Point Bar Water Works

7 Draw a labelled sketch to show a meander. How does a river cliff form? How does a point bar form?

8 Meander Cross-Section

9 Draw a labelled sketch to show a meander cross-section. Label where it will be deeper and why. Label where it will be shallower and why. Activity

10 Ox-bow Lakes Meanders become more extreme. This creates a narrow neck of land. Fast current erodes the neck cutting off the meander. Meander is sealed off by deposition to create an ox-bow lake.

11 Draw an annotated sketch to show how sn ox-bow lake forms.


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