What would you say was the extend of the ice cover? This map shows the maximum extent of ice cover during the last ice age, 20,000 years ago. What would you say was the extend of the ice cover? 100%? 50%? A third? 2/3?
KEY IDEAS & QUESTIONS What is a glacier? How glaciers shape the landscape; processes of freeze-thaw, plucking and abrasion.
3/4 Describe a glacier. Name some of the processes of glacial erosion; freeze-thaw, plucking and abrasion. 5/6 Describe a glacier in detail using key terminology. Name the processes of glacial erosion; freeze-thaw, plucking and abrasion. Describe how these processes work to shape the landscape. 7+ Describe a glacier in detail using a full range of key terminology. Name all 3 processes of glacial erosion; freeze-thaw, plucking and abrasion. Describe in detail how these processes work to shape the landscape.
Pick the description of best fit! Ice only covered Scotland and Ireland. England was not covered by ice. Ice covered most of Scotland, Ireland & Wales and came as far south as the Bristol Channel in England. Ice covered the whole of the UK apart from London. The whole of the UK was covered by ice. Pick the description of best fit!
Are all glaciers the same? Describing glaciers What are glaciers like? Colours? Shapes? Sizes? Are all glaciers the same?
1 2 3 Moraine Crevasse 4
1. What is the definition of a 'glacier'? 2. How thick must the ice be to qualify as a glacier? 3. What is the largest glacier on Earth & where is it located? 4. How does a glacier form?
1. What is the definition of a 'glacier'? A slow moving river of ice
2. How thick must the ice be to qualify as a glacier? 164 ft thick
3. What is the largest glacier on Earth & where is it located?
4. How does a glacier form? Weight Pressure Gravity Why are these 3 words important?
Describing glaciers Glaciers are…
Glaciers have the same processes as rivers.
Where do you think erosion is most likely to happen? Where do you think transportation is most likely to happen? Where do you think deposition is most likely to happen?
Freeze-Thaw Plucking & Abrasion
Freeze-Thaw Weathering
Freeze-Thaw Weathering The water freezes and expands, putting pressure on the rock. The ice thaws, releasing the pressure. B Rain water gets into a crack in a rock. C This process is repeated many times until the rock shatters and breaks apart.
Freeze-Thaw Weathering B Rain water gets into a crack in a rock. A The water freezes and expands, putting pressure on the rock. The ice thaws, releasing the pressure. C This process is repeated many times until the rock shatters and breaks apart.
Plucking & Abrasion
What do you think these words mean? How might they cause a glacier to wear away the bedrock?
Plucking
Move the labels into the correct place to explain how plucking works A piece of rock is pulled out of the ground by the glacier Ice freezes to a part of the ground Ice continues to flow down the slope
Abrasion
How does it link to abrasion? Sandpaper How does it link to abrasion?
The glacier acts like sandpaper. Bits of rock stuck in the ice grind against the ground below the glacier, wearing it away. The glacier acts like sandpaper.
How do glaciers erode the landscape? Water gets into cracks in the rocks. The water freezes and expands, putting pressure on the rock. The ice then thaws, releasing the pressure. The process repeats itself many times until the rock shatters and breaks apart. Meltwater underneath, on the back or the sides of the glacier freezes onto the rock. As the glacier moves forward it pulls pieces of rock out. Bits of rock stuck in the glacier grind against the rock below the glacier, wearing it away – a bit like sandpapering. Abrasion Freeze-Thaw Plucking
Freeze-Thaw Abrasion Plucking Demonstrate your understanding of the 3 key words by creating a word art picture for each. Freeze-Thaw Abrasion Plucking
How do glaciers erode the landscape? Water gets into cracks in the rocks. The water freezes and expands, putting pressure on the rock. The ice then thaws, releasing the pressure. The process repeats itself many times until the rock shatters and breaks apart. Meltwater underneath, on the back or the sides of the glacier freezes onto the rock. As the glacier moves forward it pulls pieces of rock out. Bits of rock stuck in the glacier grind against the rock below the glacier, wearing it away – a bit like sandpapering. Freeze-Thaw Plucking Abrasion
KEY IDEAS & QUESTIONS What is a glacier? How glaciers shape the landscape; processes of freeze-thaw, plucking and abrasion.
3/4 Describe a glacier. Name some of the processes of glacial erosion; freeze-thaw, plucking and abrasion. 5/6 Describe a glacier in detail using key terminology. Name the processes of glacial erosion; freeze-thaw, plucking and abrasion. Describe how these processes work to shape the landscape. 7+ Describe a glacier in detail using a full range of key terminology. Name all 3 processes of glacial erosion; freeze-thaw, plucking and abrasion. Describe in detail how these processes work to shape the landscape.
A word from each letter from today’s lesson Plenary GLACIER A word from each letter from today’s lesson
Independent Learning Opportunity Flexible Addition: Now you know a bit more about glaciers, add more information to your Ice cover page. Subtraction: Most of the world’s glaciers are disappearing – find out about Glacier National Park in Montana USA – a good example of melting glaciers. Division: The RMS Titanic was split in two by an iceberg. Find out about this pesky piece of ice! 2 & 3 can be done as a PowerPoint, on paper, a poster or fact file Bring your work in to gain an ILO credit Have this ready to hand in for: