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3.1.3.4 Glacial landscapes in the UK (part a) Typeit
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Glaciers produce a lot of rock debris as they grind along the valley floor and sides - through abrasion and . Rock also falls from the valley sides from areas which are ice free due to -thaw. Glaciers leave behind the rock called till. Till is unsorted meaning that the different-sized material is all jumbled up. It takes water to sort material by size rather than ice. The rock pieces are also angular. There are several types of moraine. moraine records the maximum extent of the glacier. On the valley sides are deposits of moraine. But moraine is also found running along the centre of a glacier- this was lateral moraine, but its caused when two glaciers meet. It's called moraine. When there is ice, moraine trapped within the ice is called englacial, and ice at the base of the glacier is called moraine.
A is an egg-shaped mound on the floor of a glacial trough. An example may be 30 m high and 300 m long with the tapered end pointing in the direction of flow. It is made of clay which is composed of large and small pieces of rock that have been shaped by the glacier as it moved down the valley. The material has come from glacial erosion. Some material comes from freeze-thaw where water gets into cracks in the rock, freezes, expands and breaks the rocks apart. The material has been deposited because the glacier starts to melt as it reaches warmer temperature at lower altitudes or because the glacier has melted due to rising temperatures at the end of the ice. Sometimes you see large boulders which appear out of place. They may be made of different rock to the surrounding geology - meaning that they came from elsewhere and were dropped by glaciers. These are called .
A is an egg-shaped mound on the floor of a glacial trough. An example may be 30 m high and 300 m long with the tapered end pointing in the direction of flow. It is made of clay which is composed of large and small pieces of rock that have been shaped by the glacier as it moved down the valley. The material has come from glacial erosion. Some material comes from freeze-thaw where water gets into cracks in the rock, freezes, expands and breaks the rocks apart. The material has been deposited because the glacier starts to melt as it reaches warmer temperature at lower altitudes or because the glacier has melted due to rising temperatures at the end of the ice. Sometimes you see large boulders which appear out of place. They may be made of different rock to the surrounding geology - meaning that they came from elsewhere and were dropped by glaciers. These are called .