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What Are the Stages in the Formation of a Waterfall?

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What Are the Stages in the Formation of a Waterfall? C/W Date: What are the stages in the formation of a waterfall? Starter: Write a list of 5 words that you associate with waterfalls. C/W Date: Waterfalls in the UK Lesson Objectives You must be able to label features of a waterfall. You should be able to describe the formation of a waterfall. You could be able to include erosional processes into answers. What is a waterfall? •THINK •WRITE •SHARE •DISCUSS Watch this video link : https://www.youtube.com/watch?v=fOI7aKvrFn4 How do waterfalls form? How do waterfalls form? Features of a waterfall: How did you do? Can you draw and label a waterfall diagram with the correct label? Resistant rock, Less-resistant rock, Gorge, Overhang, Plunge Pool, Retreating, Undercutting Features of a waterfall: How did you do? Activity One: Sketch the diagram below and label the key features using the key terms explored. More-resistant rock Overhang Gorge Retreating Less-resistant rock Undercutting Plunge Pool Resistant rock, Less-resistant rock, Gorge, Overhang, Plunge Pool, Retreating, Undercutting E.G High Force Waterfall The overhang is made-up High Force means High from a resistant rock call Waterfall in Norse (Viking) Whin sill. Found on the River Tees in County Durham. Limestone and sandstone is found at the bottom of The waterfall is 21 metres the cliff. from the plunge pool to the overhang. Carved by melted glacial water E.g. Cheddar Gorge from the last ice age. The river has disappeared and replaced by a road. Found In Somerset, South-West The gorge’s cave have England evidence of pre-historic people, including Britain’s oldest skeleton. Formation of a waterfall Cut out the sorting task statements below and organise these into the correct sequence of events. A steep-sided gorge is formed as the waterfall retreats. The hard rock is left overhanging and because it isn’t supported, it eventually collapses. The soft rock erodes more quickly, undercutting the hard rock. The fallen rocks crash into the plunge pool. They swirl around, causing more erosion. Over time, this process is repeated and the waterfall moves upstream. Formation of a waterfall Cut out the sorting task and organise the statements into the correct sequence of events. The soft rock erodes more quickly, undercutting the hard rock. The hard rock is left overhanging and because it isn’t supported, it eventually collapses. The fallen rocks crash into the plunge pool. They swirl around, causing more erosion. Over time, this process is repeated and the waterfall moves upstream. A steep-sided gorge is formed as the waterfall retreats. Waterfalls in the UK Activity In your exercise book, write a PEE paragraph about how a waterfall is created and how it leads to the formation of a gorge. • Use the key geographical terms. • Use key UK examples • Use the connective below. Connectives To begin with… Initially… Secondly… Eventually… Finally… This is because… This means that… This results in… As a result… Aim High: Can you add key erosional processes? Plenary 3 things I have learnt from this lesson: 1. 2. 3. 1 thing I would like to know about waterfalls 1. .
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