17 annotated ice and glaciers

17 annotated ice and glaciers - Glaciers and Ice St Elias...

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Chapter 22: Amazing Ice: Glaciers and Ice Ages Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak St. Elias Mountains, Luan National Park, Yukon Canada Glaciers and Ice
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Chapter 22: Amazing Ice: Glaciers and Ice Ages Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak
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Chapter 22: Amazing Ice: Glaciers and Ice Ages Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak Fig. 22.03 a W. W. Norton
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Chapter 22: Amazing Ice: Glaciers and Ice Ages Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak Glaciers Thick masses of recrystallized ice. Last all year long. Flow via gravity. 2 categories: Continental and mountain. Glaciers presently cover ~10% of Earth. During ice ages, coverage expands to ~30%
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Chapter 22: Amazing Ice: Glaciers and Ice Ages Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak Mountain Glaciers Flow from high to low elevation in mountain settings. Include a variety of types. Ice caps cover tall mountain peaks. Cirque glaciers fill mountain top bowls.
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Chapter 22: Amazing Ice: Glaciers and Ice Ages Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak Continental Glaciers Vast ice sheets covering large land areas. Ice flows outward from thickest part of sheet. Two major ice sheets remain on Earth. Greenland. Antarctica.
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Chapter 22: Amazing Ice: Glaciers and Ice Ages Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak Thermal Categories Used to classify glaciers; determined by climate. Temperate glaciers – Ice is at or near melting temperature. Polar glaciers – Ice is well below melting temperature. Wet-bottom glaciers slide over a melted slurry. Dry-bottom glaciers are frozen to the substrate.
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Chapter 22: Amazing Ice: Glaciers and Ice Ages Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak Formation of Glacial Ice Snow is transformed into ice. Delicate flakes accumulate. Snow is buried by later falls. Compression expels air. Burial pressure causes melting and recrystallization. Snow turns into granular firn. Over time, firn melds into interlocking crystals of ice.
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Chapter 22: Amazing Ice: Glaciers and Ice Ages Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak Thin section of glacial ice Air bubbles
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Chapter 22: Amazing Ice: Glaciers and Ice Ages Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak Movement of Glacial Ice How do glaciers move? Wet-bottom glaciers – Water flows along base of glacier. Basal sliding – Ice slips over a meltwater/sediment slurry. Dry-bottom glaciers – Cold base is frozen to substrate. Movement is by internal plastic deformation of ice.
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Chapter 22: Amazing Ice: Glaciers and Ice Ages Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak Movement of Glacial Ice Two types of mechanical behavior.
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This note was uploaded on 02/22/2012 for the course CE 70 taught by Professor Johnson during the Fall '07 term at Berkeley.

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17 annotated ice and glaciers - Glaciers and Ice St Elias...

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