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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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Question

Calculate the gradient, or slope, of this portion of the Missouri River by following the steps below:

Step 1: Locate a contour line that crosses the river. Note: An index contour crosses the river in Section 26 (lower left portion of the map). Follow the index contour to the right to establish its elevation.

Elevation: ________ feet

Step 2: Locate a second index contour that crosses the river. Note: Look in Section 11, between the letters V and E in the word RIVER. What is its elevation?

Elevation: ________ feet

Step 3: Use a string and the bar scale to measure the approximate distance (to the nearest mile) between these two index contours.

Distance: ________ feet

Step 4: Calculate the gradient of the river by using the following formula: Gradient Difference in elevation (feet) / Distance (miles)

Gradient: ________ feet per mile