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| Question | Answer |
| Freeze-thaw weathering | 1. Water gets into cracks in rocks 2. Freezes when temp. reaches below 0°C 3.Puts pressure on surrounding rock as it expands 4. When water melts, pressure = released 5. Repeated freezing & thawing, widens cracks 6. Jagged pieces of rock break off |
| Corrie | 1. Snow fills existing hollows on hillside 2. Over many years snow turns to ice 3. When hollow is full, ice moves downhill as corrie glacier 4. Freeze-thaw and plucking makes backwall steep 5. Moraine dragged along base of corrie glacier makes hollow deeper by abrasion 6. Lips gets left here because erosion is less & moraine is sometimes deposited 7. After ice age, melt water was trapped by the lip making a tarn |
| Plucking | 1. Rocks stick & freeze to bottom or sides of glacier 2. Plucked away from bedrock 3. Deposited 4. Leaves behind jagged rocks |
| Abrasion | 1. Moraine embedded into glacier rubs against floor and sides of valley as it moves 2. Leaves behind smooth surface like sandpaper |
| U Shaped Valley Formation | 1. During ice age many river valleys were filled with snow which turned to ice and moved down slope as glaciers 2. Freeze-thaw weathering supplied glacier with sharp rock fragments 3. Ice plucking & abrasion eroded valley side & floor leaving flat bottomed & steep sided valley known as glacial trough 4. Glacier scraped away interlocking spurs of river valley leaving truncated spurs 5. Tributary valleys were left hanging above main valley 6. After ice melted, glacial troughs often filled with lakes called ribbon lakes because they are long and thin |
| V Shaped Valley | Narrow floors Steep sided |
| U Shaped Valley | Straight wide flat floors with truncated floors |
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