Click here. Click here. Glacier. Click here. Click here. Plucking. NGFL Interactive Word Mat. Medial Moraine. Freeze thaw. Erosion. Moraine. Physical weathering. Abrasion. Click here. Scree. Erratics. Glacier. Corrie. Arête. Pyramidal Peak. Terminal Moraine. U-shaped valley
NGFL Interactive Word Mat
Rock found within a glacier.
The rock is angular (sharp, jagged edges)
May be found:
In the glacier
Towards the sides
At the end
In the middle
A sheet of ice that moves slowly down a river valley under the influence of gravity. This is often described as a river of ice.
Erosion caused by rocks and boulders in the base of the glacier acting like sandpaper, scratching and scraping the rocks below.
Click here to view the Animation
A type of erosion where melt water in the glacier freezes onto rocks, and as the ice moves forward it plucks or pulls out large pieces along the rock joints.
Click here to view the Animation
The wearing away of the land by rivers, ice sheets, waves and wind.
Also called frost-shattering as it occurs in cold climates when temperatures are often around freezing point and where exposed rocks contain many cracks. Water enters the cracks during the warmer day and freezes during the colder night.
As the water turns into ice it expands and exerts pressure on the surrounding rock, causing pieces to break off.
This process is repeated over a period of time.
It creates sharp, jagged rock which usually forms a Scree slope, or supplies moraine to the glacier.
The break-down or decomposition of rock by physical processes. An example would be Freeze-Thaw Weathering
A slope of loose, large angular rocks broken away from the mountainside by freeze-thaw weathering.
Rocks which have been transported and deposited by a glacier some distance from their source region.
(cirque or cwm)
A steep-walled semicircular basin in a mountain caused by glacial erosion. After glaciation, the depression may contain a lake
A knife-edged rock divide between two glacial cirques
A river valley widened and deepened by the action of glaciers (ice sheets); they become ‘U’-shaped instead of the normal ‘V’-shape of a river valley.
A former river valley spur which has been sliced off by a valley glacier.
Where several corries cut back to meet at a central point, the mountain takes the form of a steep pyramid, e.g. the Matterhorn in the Alps, or Snowdon (Wales)
Long, narrow lakes found in glaciated valleys formed in locations where the glacier had more erosive power, e.g. in areas of softer (less resistant) rock or when a tributary glacier joins the main valley glacier.
A smaller tributary valley to the main glacier, Due to its size it could not erode as much of its valley as the lower main valley, and today is often the site for a waterfall crashing to the main valley floor.
A narrow band of weathered rock debris which runs down the centre of the glacier. It forms from the merging of the lateral moraines of two glaciers.
A prominent ridge of rock debris dumped at the end of a glacier and formed of unsorted boulders, sand, gravel and clay.
A narrow band of rock debris which runs along the sides of a glacier resulting from ice erosion of the valley sides and freeze-thaw weathering on the bare rock above