Ask a Question

QUESTION 9 Given what you read in the previous question and what you read in the PDF file informatio

Regular price $15.00

QUESTION 9
Given what you read in the previous question and what you read in the PDF file information about this question (and please reread all of the answers before you answer this question) why is the north side of the Grand Canyon widening much faster than the south side? Select the best answer.

Group of answer choices

A. The two major ways that rock formations erode in the Grand Canyon are erosion from floods in drainages (ravines, small creeks, large creeks) and the collapse of cliffs due to undermining of the weaker rock underneath (e.g. shale under limestone or shale under sandstone). The rate of erosion from floods in drainages is faster than the rate of erosion from rockfalls/rockslides due to undermining of cliff faces.

B. The greater number of drainages and also the greater number of larger drainages on the north side of the Colorado River, thus, means that the north rim is eroding back faster than the south rim. In other words, the south rim's retreat tends to be more influenced by cliff retreat where as the north rim's retreat is more influenced by erosion along drainages.

C. The higher elevation of the northern side results in greater amounts of precipitation (both rainfall and snow that melts) that flows into drainages. Hence, there are a lot more drainages flowing down from the north rim than from the south rim.

D. All of the other answers are correct, and hence this is the best answer.

QUESTION 10

What rock layer occurs at the top of Isis Temple that protects the weaker layer underneath, and what landform feature separates Isis Temple from the rest of the Grand Canyon? Select the best answer.

Group of answer choices

A. Temples are pieces of the plateau that have broken loose from the plateau itself. Since the Kaibab limestone is the resistant rock formation that makes up the plateau (and edge) surrounding the Grand Canyon, it is this layer of rock that forms the top of Isis Temple. Isis Temple itself is a giant block that separated from the north rim due to a giant landslide, and features of the landslide compose its border.

B. Hermit Shale makes a protective summit of Isis Templ, while creeks (drainages) separate Isis from the rest of the Grand Canyon.

C. Coconino Sandstone makes a protective summit of Isis Temple, while creeks (drainages) separate Isis from the rest of the Grand Canyon.

D. Hermit Shale makes a protective summit of Isis Temple, while narrow ridges that are eroding by rock fall separate Isis from the rest of the Grand Canyon.

QUESTION 11

SETUP: Fast Travel yourself to the pre-selected location for Granite Gorge in the Grand Canyon in the geovisualization. Move off the top and then start traversing the south side of the Colorado River looking for any Temples, or any fully isolated mountains within the Grand Canyon itself. I suggest you wander in a westward direction and look around for a couple of minutes.

Question: Have you identified any temples on the south side of the Grand Canyon? If so, where. If you could not find any temples, what would be the most best explanation for their lack - given what you have observed in section B of this lab? Select the best answer.

Group of answer choices

A. There are no clear examples of temples on the south side. There are lots of narrow ridges, but these all extend back to the edge of the south rim. The best explanation for the lack of temples on the south side is the lack of faulting. Faults break apart the rock formations of the Grand Canyon, and the fault breaks are the reason for the existence of temples. In contrast, the north side of the Grand Canyon has an extensive network of faults that separate temples from the plateau of the North Rim.

B. The south side of the Colorado River does have temples. They are found right next to the Colorado that they tower over. The Redwall Limestone is the formation that typically makes up the summits of these temples. There are too many south side temples to name, but nice ones can be found underneath Hopi Point and Shoshone Point.

C. There are no clear examples of temples on the south side. There are lots of narrow ridges, but these all extend back to the edge of the south rim. The best explanation for their lack on the south side and their presence on the north side would be the amount of drainage development. The south drainages are short and connect directly up to the south rim, while the north-side drainages are longer and much more extensive with tributary development that can separate temples.

D. There are no clear examples of temples on the south side. There are lots of narrow ridges, but these all extend back to the edge of the south rim. The best explanation for the lack of temples on the south side is the lack of big landslides on the south side of the Colorado Rive. The North Rim is both higher and wetter than the South Rim. The elevation and moisture have resulted in large landslide blocks that break loose from the North Rim. They slide slowly towards the low spot of the Colorado River. As they slide, they separate from other rock formations and end up as isolated Temples.

QUESTION 12

Are there any locations where the temples of the Grand Canyon are bounded by these faults? Select the best answer.

Group of answer choices

A. Temples are not located along either of these faults. Tributary creeks, though, are found along both the Butte and Bright Angel faults. However, there are lots of Temples that are not even close to these faults

B. There are several locations where the rocks crushed by faulting align with the Temples

C. The Butte fault is used by the Shiva Temple, but Bright Angel fault is not connected or bounded to any temple.

D. The Bright Angel fault is used by the Shiva Temple, but the Butte Fault is not aligned with any temples.

QUESTION 13

Estimate how long ago Shiva Temple (36.1668? -112.1642?) was connected to a nearby piece of topography (36.1880? -112.1403?). Select the best answer in units of years ago. Then, think about this length of time from the perspective of when the Colorado River started to flow. This thinking will be useful in the stage C essay.

Instructions: In the geovisualization, obtain the X and Y coordinates of the two different pieces of high topography (Temple and nearby matching topography) that you are given in canvas. Use the Pythagorean Theorem (as you did earlier) to measure the planimetric distance between these two highpoints in meters. Use a rate of separation of 1000 meter per Ma (million years).

Group of answer choices

A. 170,000 years ago

B. 3,400,000 years ago

C. 1,700,000 years ago

D. 340,000 years ago

Questions & Answers

Have a Question?

Be the first to ask a question about this.

Ask a Question