GEO 103 Lecture 31: Glacial Period
28 Apr 2017
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Document Summary
Available data indicate warming trend from 10,000 to 6,000 years ago. Most recent expansion between 1500 and mid-to late 1800s, Profound effect on social and economic fabric of society. Accounts for several famines as well as migrations of many europeans to the new world. This led to a lot of famines and very harsh winters which helped to push europeans to the. Glacier is mass of ice on land that moves by plastic flow and basal slip. Capable of significant erosion, transport, and deposition of sediment. Continental glaciers - ice sheets - unconfined by topography - > 50,000 km3. Basal slip increases if the base of the glacier has more water since it lubricates the surfaces. If the base is dry, there is very little slippage. Glaciation occurs when winter snow accumulation is greater than summer melting. Glacial ice forms when snow pack > 40m. When zones in balance, glacier has balanced budget.
