Glaciation Case Study Facts

When was the peak of the Devensian glaciation?

18,000 glaciation

What is the lower ground mostly formed of?

sedimentary mudstone

what is the higher ground mostly made of?

igneous tuff and basalt

What is the name of the smallest corrie and its height?

Cwm Ceunant (50m)

Name of the medium corrie and its back wall height?

Cwm Graianog (200m)

Name of the deepest corrie and its back wall height?

Cwm Idwal (373m)

Named example of a glacial trough?

Nant Ffrancon

How many of the corries in Snowdonia ave a northerly aspect?

15 out of 17

Name of the ice sheet that covered Minnesota?

Laurentide

When was the last glacial maximum in Minnesota?

Wisconsinian (11,000 years ago)

How much area did the ice sheet that covered Minnesota cover?

440,000 km2

What was the temperature fluctuation in Minnesota?

plus/minus 5C

What were the rocks that were less resistant to erosion in Minnesota?

Basalt and shale

What was the rock that was more resistant to erosion in Minnesota?

Granite

named mountain in Minnesota and its height?

Eagle Mountain (701m)

Named lake in Minnesota and its depth?

Lake Vermilion (23m)

Named proglacial lake and its area and depth?

Lake Agassiz (285,000km2 and 400m deep)

Example of a sediment lobe in the north of Minnesota?

Rainy lobe (coarse till with sediment fragments)

Named lobe to the south of Minnesota?

Des Moines (tan and clay rich)

What human activity is occurring in Prudhoe Bay, Alaska?

Resource extraction (oil)

How long is the Trans Alaskan pipeline?

1300km

How many barrels of oil get transported by the Trans Alaskan pipeline daily?

1.4 million

What does ANWR stand for and what is its purpose?

Arctic National Wildlife Refuge - it is a key calving ground for caribou

How many barrels of petroleum products does the US consume in a year?

7.28 billion

Population of Barrow?

Over 4600

How much warmer is Barrow than the surrounding areas?

2.2C

How much of Alaska has permafrost?

80%

Subsidence rates on the North Slope?

Average 3-4cm annually but up to 12cm/year

How thick is the active layer on the North Slope?

30-80cm

Where is the Grand Dixence Dam?

Val des Dix (Switzerland)

How high is the Grand Dixence Dam?

285m

How much water is stores in Lac de Dix?

400 million m3

How many glacier feed Lac de Dix?

35

How much of Switzerland’s energy is Hydro Electric Power?

60%

How much energy does the Grand Dixence dam provide?

2000 GWh annually

Which river has restricted flow due to the dam?

Borgne River

How much lower are sediment concetrations below the dam than above?

15 times lowers

What is the sediment concetration of water when it is being released from the dam to purge sediment?

200,000 mg/L

How has the dam affected the amount of sediment flowing into Lake Geneva?

It has halved

Where is there risk of flooding when dam water is released?

Val d’Hérens