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2/22 ERS102
Course: ERS 102, Spring 2008School: University of Maine
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Extra 2/22/08 Credit- February 25th 4:00pm DPC Rm 117 Glaciations and Maine II Important Concepts 1) How glaciers form 2) Glacial Features and interpretation 3) Hot glaciers shaped Maine's landscape Glacial Advance and Retreat: Balance Between Accumulation and Ablation o Ablation=melting + sublimation o Glaciers Balance o Glaciers Equilibrium o Snowline= elevation above which snow remains year- round...
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Extra 2/22/08 Credit- February 25th 4:00pm DPC Rm 117 Glaciations and Maine II Important Concepts 1) How glaciers form 2) Glacial Features and interpretation 3) Hot glaciers shaped Maine's landscape Glacial Advance and Retreat: Balance Between Accumulation and Ablation o Ablation=melting + sublimation o Glaciers Balance o Glaciers Equilibrium o Snowline= elevation above which snow remains year- round "equilibrium line" Glacial Equilibrium: Controls glacier movement o Accumulation=Ablation o Ice front does not move o Accumulation > Ablation o Accumulation < Ablation How is the movement of a glacier tied to climate? 1) Warmingmelt 2) Less snow (rain) change in weather Ice always moving forward even if glacier is retreating Retreat means ice is melting faster than can be replaced by flow Grounded ice: pinned on obstruction Glacial Marine sediment: Iceberg debris + outwash Glacial Effects on Landscape o Glaciers are important forces of landscape change via... Erosion, transport, deposition and Glacial Erosion o Glaciers erode substrates in several ways Plucking- ice breaks off and removes bedrock fragments Abrasion- rocks in ice polish... Glacial Erosion: Abrasion Glacial Transport: At base of the ice o Till- heterogeneous mixture of glacially eroded and transported material o Range of transport distances o Roughly mirrors bedrock composition o Erratic- boulder that has a composition different than the underlying bedrock o May be associated with till, or left behind after till is eroded Examples: Granite sitting on Striated Volcanic rocks... granite is erratic Glacial Transport: In the Ice
o Sheer Planes Glacial Transport: Water In the Ice (Glaciofluvial) o Moulin o Ice tunnel mouth Alpine Glacial Features: Erosional o Alpine glaciation "sharpens" the landscape o Mt. Katahdin o Arete- "knife edge" o Cirque- bowl-shaped accumulation area o Tarn- basin filled with water chimney pond o U-shaped valley northwest basin, Mt. Katahdin
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University of Maine - ERS - 102
2/20/08Glaciations and Maine Important Concepts: 1.) How glaciers form 2.) Glacial features and interpretation 3.) Hot glaciers shaped Maine's landscape Cretaceous o Granite intruded in S. Maine o Hot Spot? Sediments removed: o Erosion removal of s
University of Maine - ERS - 102
2/15ERS102 Important concepts o Plate tectonic theory o How plates interact o Evidence of plate interaction Triassic: 245 MYA -Beginning of the Bay of Fundy o Rifting- the Bay of Fundy is a "failed rift" o Basalt Dikes- Schoodic Point ME o Diabase=
University of Maine - ERS - 102
Exam Next Monday Causes of climate change Important concepts o What causes climate change? What is climate? o Long-term average of day-to-day weather over a specific time period Temperature Precipitation Wind speeds and directions Climate change o
University of Maine - ERS - 102
The Factors of Climate Change o Can control amount of energy to earth by sunspots and astronomical theory 1. Precession 2. Eccentricity 3. Obliquity- tilt of axis o Amount of Energy that remains (leaves) at the Earth's surface o SO2 (volcanic) reflec
University of Maine - ERS - 102
Global Climate Change and the Atmosphere Ozone Hole Global Warming Be able to distinguish the two for the test Information from Ice Cores Sea level = add H2O = Increase volume heating Effect of precipitation changes: flooding, drought Impacts on agr
University of Maine - ERS - 102
Gordon Hamilton Climate Change, Cryosphere, Sea Level What causes the sea level to change? o Terrestrial water storage, extraction of groundwater, building of reservoirs, changes in runoff, and seepage into aquifers o Subsidence in river delta region
University of Maine - ERS - 102
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University of Maine - ERS - 102
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University of Maine - ERS - 102
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University of Maine - ERS - 102
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CSU Fullerton - FIN - 332
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CSU Fullerton - FIN - 332
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CSU Fullerton - FIN - 332
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