HL Geography - Option C: Extreme Environments

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34 Terms

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Glacial mass budget

how ice accumulates and melts on a glacier which determines whether a glacier advances or retreats

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U-shaped valley

a shape left behind by the glacier with a misfit stream

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corrie or cirque

an amphitheater-like valley formed by glacial erosion characterized by deep, wide basins with very steep concave walls at its head as well as sides.

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arĂŞte

a narrow ridge of rock that separates two valleys

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Bergschrund

a feature formed at the beginning of a glacier when the initial ice mass becomes too heavy and breaks away from its base

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pingos

dome shaped hills common in periglacial areas characterized by permafrost and a seasonally changing active layer. At the core is an ice lens, and the surface layer made of soil

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patterned ground

symmetrical pattern of geometric shapes formed by the deformation of ground material in periglacial regions.

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solifluction

when land mass moves down a slope due to freeze-thaw activity

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Ice wedges

vertical masses of ice that penetrate down, formed as a result of the large amounts of ground ice present

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rain-shadow effect

an area of significantly reduced rainfall behind a mountainous region forcing it to become a desert

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rock pedestals

a naturally occurring rock whose shape resembles a mushroom as a result of wind erosion

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mesas

sections of a plateau eroded away by water that are wider than they are tall

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buttes

eroded mesas that are taller than they are wide

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dunes

aeolian sands (sand moved by wind) trapped by barriers begins to build up

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the Aral Sea

a lake which lies on the border of Kazakhstan and Uzbekistan

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75%

the Aral Sea has lost (…) of it’s original surface area

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22

the number of fish species that have gone extinct in the Aral Sea

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150 thousand tons

the amount of salt which has been lifted from the Aral Sea

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Kokaral Dam

Dam constructed by Kazakhstan across a narrow stretch of the Aral Sea, splitting off the North Aral Sea from the much larger South Aral Sea.

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13km and 100 million dollars

length and cost of the Kokaral Dam constructed by Kazakhstan

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the Sahel

a semi-arid zone stretching from the Atlantic Ocean in West Africa to the Red Sea

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60km per year

estimated growth of the Sahara as the Sahel dries

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Uranium

Niger’s biggest mineral export

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3434 tonnes

the amount of Uranium extracted in Niger in 2006

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Areva

the French company owner of the biggest mine in the North of Niger

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40%

Uranium represents (…) of Niger’s total exports

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4.5%

Resource extraction represents (…) of Niger’s GDP

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270 million m3

the amount of water estimated to be extracted in the next 40 years in Niger for Resource extraction

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the Trans-Alaska Pipeline System (TAPS)

an oil transportation system spanning Alaska that conveys oil from Prudhoe Bay to Valdez

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800 miles

the approximate length of the Trans-Alaska Pipeline System (TAPS)

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8 billion dollars

the cost to construct the Trans-Alaska Pipeline System (TAPS)

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16 billion as of 2010

the TAPS pipeline has shipped almost (…) barrels of oil as of (…)

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85%

the percentage of Alaska’s revenue which comes from the petroleum industry

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46’000 gallons of oil and water

The size of a spill caused by a crack in the TAPS pipeline in 2009