In this unit we will look at… Glaciated Landscapes

In this unit we will look at…

• Glaciated Landscapes

• Limestone Landscapes

• Coastal Landscapes

• You will…

• Learn about the landforms associated with each landscape

• Have to be able to describe and explain the formation of the landforms

• Have to be able to draw sketches of some landforms

• Have to know the processes that shaped these landscapes

• Learn how to identify landscape features on an O.S map

Glaciated Landscapes

• Throughout the lithosphere unit you will use O.S maps to identify features, using 4 and 6 figure grid references.

• Task 1;

• Look at the O.S map of the Cairngorms on the next slide and describe the evidence which shows that this area was once affected by glaciation.

• Find features of glaciation on the map extract, and use 4 and 6 figure grid references to show where the features are on the map.

Remember!

• U-shaped valleys and

• corries are features of

• glacial erosion.

• But what processes have

• shaped these landforms,

• and other landforms of

• glacial erosion?

Plucking;

• Plucking;

• When rocks have become weakened by freeze-thaw, the moving glacier freezes onto the valley sides and floor

• As the glacier moves downslope by gravity, the rocks that the glacier has frozen onto are torn away from the valley sides and floor

• This produces rough, jagged rock surfaces

• By tearing away huge rocks, the valley sides are left very steep and the base very flat.

• Abrasion;

• The jagged rocks and stones embedded at the base of the glacier or ice sheet, scrapes along the valley sides and base.

• This is like a sandpapering effect, where the valleys sides and base become smooth

• Where the rocks embedded in the glacier scratch along the surface, striations may be left on the rock surface. Striations are scratch marks on the rock surface.

Homework

• For tomorrow…

• Answer the 1998 past paper question on

• Glaciation (3b)

• 3b) is worth 4 marks so you are looking for 8 points to make

Task 1:

• Using the information that you have just heard and your

• notes, answer the following question;

• Select one feature of glacial erosion

• and explain the processes involved in the

• formation of this feature.

• Annotated diagrams may be used.

• 3 marks

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