Transcript Question of Glaciation

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A Question of Glaciation
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Why is glacial ice blue?
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How was this feature formed?
3
What can you see? What might this be?
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This photo was
taken in
Iceland…….
How has this
deep, water
filled hollow
been created?
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Why is it dangerous to ski on snow
covered glaciers?
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What is the grey material in the
foreground? How recently was it deposited?
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What might
happen next
and why?
Spot the
difference!
8
Describe the glacial features of this
view!
9
X
This photo was taken in the Lake
District. What feature is hidden from
view at X. Why is it hidden?
Clean, pure ice is not colourless, but
slightly blue. The colour, however, is so
faint that a small block of ice will look
clear. Only very large blocks look blue.
Sunlight contains all the colours of the
rainbow. Ice absorbs more red and
yellow light than blue light. As a result,
slightly more blue light passes through a
block of ice.
The feature is a roche moutonnee.
Ice coming from the right of the
photo smoothed the rock through
the process of abrasion.
On the down ice end of the rock
plucking happened where the ice
had temporarily adhered and then
was pulled away.
The photo shows a cross section of a
feature made of stratified sediments.
The shape of the cross section and the
elongated nature of the feature
suggests that it could be an esker.
Eskers are fluvioglacial in origin and are
formed of deposits laid down in sub
glacial streams.
No, this ‘crater’ isn’t volcanic in origin!
The deposits are outwash sands and
gravels which are down valley of a
retreating glacier. A detached block of
ice, buried in these deposits, has melted
allowing the deposits to ‘cave in’ creating
a kettle hole.
Snow on glaciers
can hide crevasses.
Ropes are needed
when walking on
glaciers
Crevasses occur where ice moves more
quickly e.g. near the surface and the
centre of the glacier or where the slope
over which it is moving gets steeper.
The grey materials form part of a lateral
moraine which has been deposited at the
side of the glacier. The moraine comprises
angular, unsorted material of varying size.
It is recently deposited as no vegetation
has yet begun to colonise it.
Notice how the valley side above the
moraine is vegetated. Look also at the
freshly scoured rock immediately to the
left of the glacier.
The photos of the Glacier du Trient on
the Swiss/French border were taken in
1985 and 1995.
They show the
amount of glacial
retreat which
global warming can
cause in just ten
years.
The one on the right
was taken in 2003!
ice falls
plucking
lateral
moraine
glacier
lateral moraine
crevasses
zone of
ablation
snout
unsorted, angular moraine
scale!
The photo shows the lip of a corrie in
the Lake District. Corrie lips develop
because erosion is less intense under
shallower ice at the front of the corrie.
The lip can also
be heightened
by deposition.
Hidden from
view in the
photo is
Stickle Tarn.