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What is glaciation? | Glaciation is the study of ice and its impact on the environment. |
What are the types of glacial erosion? | Plucking, abrasion and freeze thaw. |
What is plucking? | Plucking is when melted water from a glacier freezes around lumps of cracked and broken rock. When the ice moves downhill, rock is plucked from the back wall. |
What is abrasion? | Abrasion is when rock frozen to the base and the back of the glacier scrapes the bed rock. |
What is freeze thaw? | Freeze-thaw is when melted water or rain gets into cracks in the bed rock, usually the back wall. At night the water freezes, expands and causes the crack to get larger. Eventually the rock will break away. |
What are the glacial landforms that occur in uplands? | Corrie, Arete, Pyramidal Peaks and Tarn. |
What is Arete? | A narrow, knife edge ridge separating two corries. |
What are Pyramidal Peaks? | A peak formed when three or more corries form in the side of one mountain. |
What is Corrie? | An arm chair shaped hollow found in the side of a mountain. |
What is Tarn? | A lake found in a corrie. |
What are the glacial landforms that occur in lowlands? | U-shaped Valleys, Truncated Spurs, Hanging Valleys, Ribbon Lakes and Drumlins. |
What is a U-shaped Valley? | This a valley which was V-shaped but has been eroded by ice. The valley sides are steeper and the valley floor flatter after the ice melts. |
What are Truncated Spurs? | These are spurs which have been cut through by ice. |
What are Hanging Valleys? | These occur when glaciers at higher levels than the main valley didn't experience such powerful erosion. Tributary streams enter the valley as waterfalls from hanging valleys. |
What are Ribbon Lakes? | These are lakes found in U-shaped valleys. |
What are Drumlins? | These are hills shaped like eggs. |