Glaciation odd one out Identify the odd one out in each of the terms given below and suggest a reason why it is the odd one out. For example: bergschrund snout cirque arête Reason: Bergschrunds, arêtes and cirques are upland glaciation features. The snout is the end of the glacier where melting occurs. Find the odd one out plucking abrasion erosion moraine medial interglacial terminal lateral glacial budget accumulation ablation abrasion Reason: Reason: Reason: © www.teachitgeography.co.uk 2012 18389 Page 1 of 5 Glaciation odd one out tarn drumlin till boulder clay corrie tarn cirque cwm roche moutonnée pyramidal peak Matterhorn arête misfit stream U-shaped valley ribbon lake frost shattering 10% expansion erosion Reason: Reason: Reason: corrie lake Reason: freeze-thaw weathering Reason: © www.teachitgeography.co.uk 2012 18389 Page 2 of 5 Glaciation odd one out U-shaped valley truncated spur arête ribbon lake plucking glacial meltwater erosion hanging valley till drumlin striation erratic abrasion upland glaciation circular motion rotational slip corrie lip arête Reason: roche moutonnée Reason: egg-shaped Reason: Reason: Reason: © www.teachitgeography.co.uk 2012 18389 Page 3 of 5 Glaciation odd one out Answers plucking abrasion erosion moraine Reason: Plucking and abrasion are processes of erosion. Moraine is eroded material transported and deposited by a glacier. medial interglacial terminal lateral Reason: An interglacial is a warmer spell between two ice ages. Medial, terminal and lateral are three types of moraine. glacial budget accumulation ablation abrasion Reason: The glacial budget is the balance between accumulation and ablation. If accumulation exceeds ablation, the glacier snout will advance. Abrasion is a process of glacial erosion. tarn drumlin till boulder clay Reason: Boulder clay or till is an unsorted ground moraine which is sometimes moulded by the glacier into drumlins. A tarn is a lake in a corrie. corrie tarn cirque cwm Reason: A corrie can also be called a cirque or a cwm. A tarn is the lake sometimes found in a corrie. roche moutonnée pyramidal peak Matterhorn arête Reason: The Matterhorn is a classic example of a pyramidal peak with arêtes. A roche moutonnée is a smaller scale example, where a hard outcrop of rock has been smoothed and plucked by glacial erosion. corrie lake misfit stream U-shaped valley ribbon lake Reason: Misfit streams and ribbon lakes are found in U-shaped valleys, whereas corrie lakes are an upland feature. © www.teachitgeography.co.uk 2012 18389 Page 4 of 5 Glaciation odd one out freeze-thaw weathering frost shattering 10% expansion erosion Reason: Freeze-thaw weathering is where water successively freezes and thaws in a crack over many nights, expanding by 10% and enlarging the crack until it shatters the rock, i.e. it is a process of weathering rather than erosion. U-shaped valley truncated spur arête ribbon lake Reason: Ribbon lakes and truncated spurs occur in U-shaped valleys. An arête is an upland glaciation feature. roche moutonnée glacial meltwater plucking erosion Reason: A roche moutonnée is formed partly by the erosional process of plucking in an upland area. Glacial meltwater flows from the snout of a glacier, usually in a lowland area. egg-shaped hanging valley till drumlin Reason: Drumlins are egg-shaped features of glacial deposition. They are formed of till or boulder clay. Hanging valleys are erosional features. striation till abrasion upland glaciation Reason: Till is a glacial deposit in a lowland area, whereas striations occur through abrasion in glaciated upland areas. circular motion rotational slip corrie lip arête Reason: Snow and ice accumulate in hollows on the side of the mountain. This moves in a circular motion, known as rotational slip, over the lip of the corrie. Arêtes develop between corries. Extension activity Students can use notes to create their own ‘Glaciation odd one out’ activity. This can be shared with other students in the class. Students could add another glaciation key word or phrase to the existing table but continue to preserve the correct odd one out. © www.teachitgeography.co.uk 2012 18389 Page 5 of 5