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Glacier PowerPoint PPT Presentation


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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

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Glacier

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Glacier

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Glacier

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Plucking

NGFL Interactive Word Mat

Medial Moraine

Freeze thaw

Erosion

Moraine

Physical weathering

Abrasion

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Scree

Erratics

Glacier

Corrie

Arête

Pyramidal Peak

Terminal Moraine

U-shaped valley

Glacial trough

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Hanging Valley

Lateral Moraine

Truncated spur

Ribbon lake


Glacier

Moraine

Rock found within a glacier.

The rock is angular (sharp, jagged edges)

Unsorted

May be found:

In the glacier

Towards the sides

At the end

In the middle


Glacier

Glacier

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.

http://www.ngfl-cymru.org.uk/eng/vtc_-_ks4_-_geog_-_glaciers_(p._montague)_(isf_55)


Abrasion

Abrasion

Abrasion

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


Plucking

Plucking

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


Erosion

Erosion

The wearing away of the land by rivers, ice sheets, waves and wind.


Freeze thaw weathering

Freeze Thaw Weathering

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.


Physical weathering

Physical weathering

The break-down or decomposition of rock by physical processes. An example would be Freeze-Thaw Weathering


Scree

Scree

A slope of loose, large angular rocks broken away from the mountainside by freeze-thaw weathering.


Erratics

Erratics

Rocks which have been transported and deposited by a glacier some distance from their source region.


Corrie

Corrie

Corrie or

(cirque or cwm)

A steep-walled semicircular basin in a mountain caused by glacial erosion. After glaciation, the depression may contain a lake

http://www.ngfl-cymru.org.uk/eng/vtc_-_ks4_-_geog_-_ice,_rivers_and_the_sea_-_glaciation_of_cwm_idwal


Ar te

Arête

A knife-edged rock divide between two glacial cirques


U shaped valley glacial trough

U-shaped valleyGlacial trough

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.


Truncated spur

Truncated spur

A former river valley spur which has been sliced off by a valley glacier.


Pyramidal peak

Pyramidal Peak

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)


Ribbon lake

Ribbon lake

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.

http://www.ngfl-cymru.org.uk/eng/vtc-ks3-geog-glaciation-terminal_moraine_ribbon_lakes


Hanging valley

Hanging valley

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.

http://www.ngfl-cymru.org.uk/eng/hanging_valleys


Medial moraine

Medial Moraine

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.


Terminal moraine

Terminal Moraine

A prominent ridge of rock debris dumped at the end of a glacier and formed of unsorted boulders, sand, gravel and clay.

http://www.ngfl-cymru.org.uk/eng/vtc-ks3-geog-glaciation-terminal_moraine_ribbon_lakes


Lateral moraine

Lateral Moraine

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


Glacier

How many glacial features can you name in this photograph?


Glacier

What is this feature? What processes created this landform?


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