Answered: 5. What is the magnitude (i.e. absolute…

Applications and Investigations in Earth Science (9th Edition)

9th Edition

ISBN:9780134746241

Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Chapter1: The Study Of Minerals

Section: Chapter Questions

Problem 1LR

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Transcribed Image Text:**Horizontal Velocity Profile of the Athabasca Glacier** **Graph Explanation:** The graph on the left displays the vertical velocity profile of the Athabasca Glacier in Canada. The horizontal axis represents the horizontal velocity in meters per year (m/y), ranging from 0 to 30 m/y. The vertical axis represents the depth in meters (m), extending from 0 m (surface) to 200 m (bedrock). The plotted points form a curve that shows the change in velocity with depth, indicating higher velocities near the surface and lower velocities approaching the bedrock. **Text Explanation:** The text accompanying the graph presents a set of calculations derived from the velocity profile at a depth of 165 m, based on specified depth and velocity data at 150 m and 180 m. The given data includes: - Velocity at 150 m: 24.5 m/yr - Velocity at 180 m: 17 m/yr - Ice density: 900 kg/m³ - Gravitational acceleration (g): 9.8 m/s² - Glens flow law exponent (n): 3 **Questions for Calculation:** 5. **Strain Rate Magnitude:** - Calculate the absolute value of the strain rate to the nearest hundredth, in yr⁻¹. 6. **Shear Stress:** - Determine the shear stress driving the strain to the nearest bar. 7. **Glens Flow Law Constant (A):** - Find the constant, A, in Glens flow law to the nearest bar⁻³·s¹. 8. **Ice Viscosity:** - Determine the ice viscosity to the nearest kPa·yr⁻¹. (Noting this is about 2 quadrillion times more viscous than water.)

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