<<>> ****A. Below is a portion of the 1989 SP Mountain, AZ topographic quadrangl

Question

<<>> ****A. Below is a portion of the 1989 SP Mountain, AZ topographic quadrangle map (USGS), scale 1:24,000. The black 1 km by 1 km UTM grid is NAD27, Zone 12S. Also note the 1 mi. by 1 mi. PLSS grid sections with red numbers in their centers. 1 . What is the point of highest elevation on the map, and how can you tell? 2 . Draw a small triangle over the point of lowest elevation on the map, and label it with the elevation. 3. To the left of SP Mountain, do a subtraction problem that finds the mountain’s total relief (from base to top) in feet. 4. Circle the five places in the map where streams (blue) begin. How can you tell which direction is upstream based on the contour lines? 5. Notice that there is an SP Mountain and an SP Crater. How can you tell which part is the crater? Color it red. 6. Describe the diameter (in km and miles) and three-dimensional shape of SP mountain, and suggest what kind of geological feature it may be. 7. Based on your answer above, what material do you think is represented by the orange-brown color (section 34)? (Courtesy of USGS) **** <<<<<<<<<<<>>>>>>>>> B. These are 2011 US Topo Series products. The digital map is matched with an orthoimage of the same area. (Courtesy of USGS) 1 . The orthoimage reveals that SP Mountain is a volcano (cinder cone) with a very visible closed depression (crater) at its summit. The image also reveals an older, reddish volcano (cinder cone) that is very eroded (worn down) . Draw a dashed line on the orthoimage and map to show the outline of this older volcano. 2 . Draw a solid line on the orthoimage and map to show the outline of the crater of the older volcano. Why is it not shown with hachure lines on the map, like the crater for SP Mountain? Below is a portion of the 1989 SP Mountain, AZ topographic quadrangle map (USGS), scale 1:24,000. The black 1 km by 1 km UTM grid is NAD27, Zone 12S. Also note the 1 mi. by 1 mi. PLSS grid sections with red numbers in their centers. 1. What is the point of highest elevation on the map, and how can you tell? 2. Draw a small triangle over the point of lowest elevation on the map, and label it with the elevation. 3. To the left of SP Mountain, do a subtraction problem that finds the mountain's total relief (from base to top) in feet. 4. Circle the five places in the map where streams (blue) begin. How can you tell which direction is upstream based on the contour lines? 5. Notice that there is an SP Mountain and an SP Crater. How can you tell which part is the crater? Color it red. 6. Describe the diameter (in km and miles) and three-dimensional shape of SP mountain, and suggest what kind of geological feature it may be. 7. Based on your answer above, what material do you think is represented by the orange-brown color (section 34)? (Courtesy of USGS) ****

Explanation / Answer

1 . What is the point of highest elevation on the map, and how can you tell?

7320 feet is the heighest elevation on Colton Crator. It is found from the contours on the map

2 . Draw a small triangle over the point of lowest elevation on the map, and label it with the elevation.

3. To the left of SP Mountain, do a subtraction problem that finds the mountain’s total relief (from base to top) in feet.

                        Total relief of SP Mountains is 400 feet

4. Circle the five places in the map where streams (blue) begin. How can you tell which direction is upstream based on the contour lines?

            Upward triangle type contour trend lines indicates direction of upstream side

5. Notice that there is an SP Mountain and an SP Crater. How can you tell which part is the crater? Color it red.

The conical depression on the top of the SP Mountain is the SP Crater

6. Describe the diameter (in km and miles) and three-dimensional shape of SP mountain, and suggest what kind of geological feature it may be.

            0.38 km is the approximate diameter of the crater

7. Based on your answer above, what material do you think is represented by the orange-brown color

The orange brown color material on the mountain is represent by lava flow rock Basalt.

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