Lab8_Maps and relative age_Winter 2019_JH

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Glendale Community College *

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111

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Electrical Engineering

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Jan 9, 2024

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doc

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4

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Geo 111 Lab Lab 8 Student name: _________________ Lab 8: Slope calculation and relative age I. Slope calculation from contour lines in a topographic map Slope is the measure of steepness or the degree of inclination of a feature relative to the horizontal plane. Slope is typically expressed as a percentage, an angle, or a ratio. The average slope of a terrain feature can conveniently be calculated from contour lines on a topo map. To find the slope of a feature, the horizontal distance (run) as well as the vertical distance (rise) between two points on a line parallel to the feature need to be determined. The slope is obtained by dividing the rise over run. Multiply this ratio by 100 to express slope as a percentage. The slope angle expressed in degrees is found by taking the arctangent of the ratio between rise and run. QUESTION 1: Calculate the gradient of hill slope between points A and B shown in the cross-section below. a) Gradient (decimal)= b) Gradient (percentage)= c) Gradient (angle)= QUESTION 2: Calculate the distance of travel from A to B. Hint: use the Pythagorean theorem equation a 2 =b 2 +c 2 II. Relative age
Geo 111 Lab Lab 8 QUESTION 3: Study the geologic cross-section below which. Use principles of cross-cutting relationships to get relative age of each marked rock formation (sedimentary layer or igneous body) and fault.
Geo 111 Lab Lab 7 III. Hand contouring Contour the map below using 100 feet contour interval .
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Geo 111 Lab Lab 7