Ice on the Land
Teacher recommended
?- Created by: Carolyn
- Created on: 01-04-13 22:52
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Clues
- A pointed mountain peak with at least three sides. It's formed when three or more back-to-back glaciers erode a mountain. E.g. Snowdon, Wales. (9, 4)
- At the top end of the glacier the ice moves in a circular motion. This can erode hollows in the landscape and deepen them into bowl shapes, like corries. (10, 4)
- Cliff-like edges on the valley side formed when ridges of land (spurs) that stick out into the main valley are cut off as the glacier moves past. (9, 5)
- Steep-sided valleys with flat bottoms.They start off as a V-shaped river valley but change to a U-shape as the glacier erodes the sides and bottom, making it deeper and wider. E.g. Nant Ffrancon, Snowdonia. (7, 7)
- The difference between total accumulation and total ablation for a year. Positive = larger glacier and snout advances down the valley, accumulation exceeds ablation. (7, 6)
- The input of snow and ice into the glacier. You get more of this than ablation in the upper part of a glacier so its called the zone of ... (12)
- The last ice age. It began around 2.6 million years ago and ended about 12,000 years ago when the Holocene began. (11)
- Valleys formed by smaller glaciers (called tributary glaciers) that flow into the main glacier. The glacial trough is eroded much more deeply by the larger glacier. so when the glaciers melt the valleys are left at a higher level. (7, 7)
- Warmer periods between glacial periods when ice retreats. Each one lasts for around 10,000 years. We are currently in an interglacial period that begun 10,000 years ago, and today ice covers 10% of the Earth's land surface. (12)
- Water gets into cracks in rocks then freezes and expands, putting pressure on the rock. The ice then thaws, releasing the pressure. If this process repeats it can make bits of rock fall off. (6, 4, 10)
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