In this weeks lessons we will be investigating Glaciers and how they erode, transport and deposit material. By the end of today's lesson you will be able.

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Presentation transcript:

In this weeks lessons we will be investigating Glaciers and how they erode, transport and deposit material. By the end of today's lesson you will be able to recognise a glacier, know what a glacial system is and what processes take place within the system.

Only a few thousand years ago much of Britain was permanently covered in a thick layer of ice. It would have looked like the previous photos. Glaciers form when the climate becomes cold enough to snow. The weight of the new snowfall turns the underling snow to ice. When this ice moves downhill under the force of gravity, it is called a glacier. Much of Britain's scenery is a result of glacial action that happened many thousands of years ago.

Look at this photo of a glacier. How big is it? What sort of landscape is it in? What is it made of? What sort of climate is needed for a glacier to exist?

Match up the correct terms. Plucking results from… Abrasion is when… …the rock fragments carried by a glacier rub against and wear away the sides and floor on the valley. It is similar to corrasion by a river, but on a much larger scale. …glacial ice melting then refreezing onto solid rocks. As the glacier moves away it pulls with it pieces of rock.

What is the glacier system? The glacier system consists of inputs, transfers (flows), stores and outputs in the same way as a river. Inputs come from avalanches along the sides of the glacier but mainly from precipitation as snow. Over time snow accumulates and is compressed into ice. The water held in storage is the glacier. Under the force of gravity, the glacier flows downhill. Meltwater is the main output from the glacier, along with some evaporation.

The balance between inputs and outputs varies. In the winter, inputs usually exceed outputs near to the head of a glacier (accumulation). In the summer and at lower altitudes, outputs will exceed inputs (ablation). The balance between the annual rate of accumulation and ablation determines whether the glacier will advance or retreat. Today, most of the world’s remaining glaciers are retreating. Meltwater pouring from a glacier’s snout, SW Iceland

Label the diagram

Accumulation and Ablation

Zone of accumulation B A Is the zone of accumulation at A or B?

Use The New Wider World Foundation Edition p248. Revision Question 1