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Ice on the Land
Changes to amount of ice on the land
The last Ice Age - Pleistocene
Time scale
· The last ice age was 18,000 years ago.
· It lasted 2 million years
Maximum amount of ice cover in the northern hemisphere.
· There were four ice sheets…

Page 2

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South Cascade Glacier, USA
· Causes
Rising global temperatures due to the interglacial period we
are in has caused the glaciers to retreat as ablation is higher
than accumulation.
· Evidence
By looking at and comparing photographs taken of the
glacier in 1900 and 2008the glacier has clearly retreated.
In…

Page 3

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· However if the glacier moves downhill it is called rotational slip.
Bulldozing
· As the glacier advances, moraine is pushed along at the snout similar
to a bulldozer.
Deposition
Reasons
· As the ice melts the moraine it was carrying or pushing gets
abandoned and dumped as the ice…

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Pyramidal peaks
· Characteristics
A sharp edged mountain which peaks have been formed
from three or more corries cutting back into one mountain.
· Formation
Much the same as arêtes except three or more corries are
formed.
Three or more corries are formed on sides of the same
mountain/hill.
The…

Page 5

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When a band of softer rock is met, the glacier is able to
erode it more easily therefore creating a rock basin.
When the glacier meets harder rock, erosion less easily
occurs, creating a rock bar.
After glacial periods have passed and the ice has melted,
the depressions left (the…

Page 6

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When the ice has melted it leaves slight ridges on the valley
sides.
Medial moraine
· Characteristics
A line of moraine in the middle of the glacier.
· Formation
When a tributary glacier meets the main glacier the two
lateral moraines combine to create the medial.
On melting a ridge…

Page 7

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Local people are employed in hotels, restaurants
and work as tour guides.
Lots of money is brought to the area boosting the
economy.
Negative
Tourism pushes prices up in housing, restaurants and
cafés as it becomes a desirable place to live.
The locals can no longer afford to live in…

Page 8

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Snowfall
Heavy snowfall that settles on a lighter layer of
snow can cause an avalanche. This is because the
lighter layer of snow is unable to support the
heavier layer of snow and so it gives way, causing a
slab avalanche.
Gradient of slopes
The steeper the slope the easier…

Page 9

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Locals can no longer benefit from the maintenance of their
town.
Less people visit the area.
Poverty as there is no longer a strong, reliable source of
income.
· Environmental
Snow melt due to higher temperatures cause the land to be
unstable possibly resulting in avalanches and flooding.
People look…

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archiegoodman2

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