PPT-They are all features of glacial erosion

1 2 3 4 Ribbon Lake Lake Windermere Lake District Arete Striding Edge Lake District Pyramidal Peak Matterhorn Switzerland Corrie amp Tarn Red Tarn Lake District KEY IDEAS amp QUESTIONS. January 21, 2011. . Glaciers act as agents of erosion and deposition to help to create unique landforms which you will study in this unit. Glacier. : A large mass of ice resting on land or floating as an ice shelf in the sea adjacent to land. Weathering. The breakdown do the materials of Earth’s crust into smaller pieces.. Physical Weathering. Process by which rocks are broken down into smaller pieces by external conditions.. Types of Physical weathering. The . surface. features of the Earth change as a result of observable physical and chemical processes . Weathering and Erosion. This is a monument . called Cleopatra’s . Needle. It was carved in Egypt around 1450B.C. The sides are carved with hieroglyphs, the writing of ancient Egypt. It stood in the dry, hot Egyptian desert for over 3000 years. During that time, the hieroglyphs remained distinct.. Presented by Calvin Wight. http://. solarviews.com. /cap/earth/. chile.htm. Outline. Background. Controls on Glaciation. Climatic. Tectonic. Latitudinal. Glacial History of the Chilean Andes. Northern. Erosive forces . Glacier. persistent . body of dense ice that is constantly moving under its own . weight.. It . forms where the accumulation of snow exceeds its ablation (melting and sublimation) over many . Darin Erickson. Aaron Gaither. Project Goals. Time lapse imagery showing glacial transformation. Area change . Retreat distance. Link glacial retreat with increasing temperatures. Correlate temperature with glacial retreat. Unit 5: Gradational Processes. Ms. . Thind. Glaciers. 10% of land is covered with glacial ice.. Store 75% of the world’s freshwater. . If all land ice melted, sea level would rise approx. 70m . Glaciers: importance?. Ch 15: p 277-281. Glaciers:. Enormous masses of moving ice created by the accumulation and compaction of snow.. Powerful agents of erosion ~ have carved some of the most spectacular features on Earth’s surface. Contrast. the features left from different types of erosion.. Analyze. the impact of living and nonliving things on the processes of weathering and erosion.. Erosion and Deposition. Section 7.2. gravity: . . (“Flow-Assisted”. . or “Flow-Accelerated”. . Corrosion). An increase in corrosion brought about by a high relative velocity between the corrosive environment and the surface.. Removal of the metal may be:. Glacier – thick ice mass that forms over hundreds or thousands of years.. 15, 000 years ago > 30 % coverage - Today 10 % coverage. Valley Glaciers. Ice Sheets. Types of Glaciers. Valley Glaciers. Definition. Used with permission from Microsoft. 20,000 years ago. ~3 km thick. Crust deformation. Mantle flows away. The ice. Used with permission from Microsoft. Glaciers retreated. Slow uplift. Mantle returned. Glaciers. Geologists define a . glacier. as any large mass of ice that moves slowly over land.. There are two types of glaciers:. Continental glaciers. Valley glaciers. Continental Glaciers. A . continental glacier. Once . glacial ice exceeds a thickness of about 150 feet, the weight of the overlying ice causes . the . base of . the glacier . to become plastic and flow like a very viscous liquid. While the bottom ice responds as a plastic solid, the surface ice is very brittle. However, from the surface down to the top of the plastic portion of the glacier, the ice experiences a decrease in .