Chapter 17

Chapter 17 - Chapter 17 Glacial and Periglacial Processes...

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Chapter 17: Glacial and Periglacial Processes and Landforms I. Introduction I.a. About 77% of Earth's freshwater is frozen, with bulk of ice in Greenland and Antarctica and remaining ice cover in various mountains and alpine valleys I.a. Cryosphere : portion of hydrosphere and groundwater that is perennially frozen, generally at higher latitudes and elevations I.b. Paleoclimatology : study of past climates and understanding future climates I. Rivers of Ice I.a. Glacier : large mass of ice resting on land or floating as ice shelf adjacent to land, not frozen bodies of water- accumulation of snow that recrystallizes under weight I.a.i. Can form on high mountains along equator (ex. Andes, Kilimanjaro) I.a. Slowly move under pressure of own great weight and pull of gravity I.b. Snowline : lowest elevation where snow can survive yearound/ lowest line where winter snow accumulation persists throughout summer I.c. Alpine Glaciers : glacier in a mountain range, or mountain glacier I.a.i. Valley glacier
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Chapter 17 - Chapter 17 Glacial and Periglacial Processes...

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