Your Perfect Assignment is Just a Click Away

We Write Custom Academic Papers

100% Original, Plagiarism Free, Customized to your instructions!


University of Houston Victoria Geology Maps and Volcanoes Questions

University of Houston Victoria Geology Maps and Volcanoes Questions

Question Description

I’m working on a geology question and need guidance to help me study.

1. Tuff cones – Menan Buttes (chapter 7, page 129)

Working with air photos: To help you get started using air photos, refer to Figures 7.15 and 7.16 and answer the following:

a. Which of the Menan Buttes is shown in Figure 7.15? How do you know? (A butte is an isolated, steep-sided hill with a flat or irregular top.)

Figure 7.15

b. Draw an arrow pointing north on Figure 7.15.

Figure 7.16 (not on scale)

c. Outline on Figure 7.16 the area covered by the right-hand aerial photograph in Figure 7.15.

d. Which direction was the sunlight coming from in Figure 7.15? How do you know?

e. REFER TO THE MAPS IN YOUR TEXTBOOK Use the map in Figure 7.16 to determine the approximate scale of Figure 7.15. Show your work. Circle or describe the features on the map and the photo that you used for your measurements.

This can be determined by measuring the distance between two points that are recognizable on both the aerial photograph and the map. For example, the distance between the narrow part of the Butte Market Lake Canal just before it enters the Snake River and the tip of the point where a tributary joins Henrys Fork (just south of the word Fork on the map) is 11.3 centimeters on the photos and 12.8 centimeters on the map.

Consider that the aerial image and the map ultimately show and represent the same ground distance.

f. Cinder cones are normally made of lapilli- and block-sized basaltic scoria. The Menan Buttes are tuff cones, which are like cinder cones, but are made of ash- and lapilli-sized basaltic pyroclasts. The Menan Buttes formed when rising basaltic magma hit abundant groundwater in the gravel along the Snake River, erupted explosively, and thereby fragmented into smaller pyroclasts than is normal with basalt. Which way was the wind blowing when the Menan Buttes erupted? Why do you say this?

g. Examine Figure 7 .15 and carefully look at the contours on Figure 7.16. Would you say that these volcanic cones are steep-sided or broad and flat? Is the rim of the crater generally sharp or is it broad and wide?

h. Recall that air photos make objects appear three or four times taller than they are. To get a more accurate view of the relief of the Menan Buttes, make a topographic profile on the graph below following the line A-A’ in Figure 7.16 of your TEXTBOOK. Use the 100-ft elevation increments of the index contours (from your TEXTBOOK), and be sure to locate the tops of ridges and the bottom of the crater.

It is important to use the graph paper provided in your textbook to make a topographic profile with NO VERTICAL EXAGGERATION. You can achieve this by hand if you keep the horizontal and vertical scale the same: one inch = 2000 feet

Add here the A-A’ topographic profile

i. How wide is this tuff cone at its base (in miles)? How tall is it (in feet)? Show your work.

j. Given their size, height, and basaltic composition, do you think that tuff cones such as these represent a substantial volcanic hazard? Are they likely to produce vast lava flows, scalding pyroclastic flows that travel 10 or 20 miles from the vent, roof ­crushing air-fall deposits, or devastating lahars? Why?

ANSWER IS GIVEN: Tuff cones are unlikely to represent a serious volcanic hazard. They are too small to produce large lava flows, they are too short and the wrong composition to produce pyroclastic flows of more than local significance, they are the wrong composition to produce large volumes of ash, and they are unlikely to produce lahars because they are too short to be capped by glaciers and too porous (being made of pyroclastic debris) to hold much of a lake in the crater. The typical hazard is posed by hydrothermal explosions.

Order Solution Now

Our Service Charter

1. Professional & Expert Writers: Gold Grades only hire the best. Our writers are specially selected and recruited, after which they undergo further training to perfect their skills for specialization purposes. Moreover, our writers are holders of masters and Ph.D. degrees. They have impressive academic records, besides being native English speakers.

2. Top Quality Papers: Our customers are always guaranteed papers that exceed their expectations. All our writers have +5 years of experience. This implies that all papers are written by individuals who are experts in their fields. In addition, the quality team reviews all the papers before sending them to the customers.

3. Plagiarism-Free Papers: All papers provided by Gold Grades are written from scratch. Appropriate referencing and citation of key information are followed. Plagiarism checkers are used by the Quality assurance team and our editors just to double-check that there are no instances of plagiarism.

4. Timely Delivery: Time wasted is equivalent to a failed dedication and commitment. Gold Grades is known for timely delivery of any pending customer orders. Customers are well informed of the progress of their papers to ensure they keep track of what the writer is providing before the final draft is sent for grading.

5. Affordable Prices: Our prices are fairly structured to fit all groups. Any customer willing to place their assignments with us can do so at very affordable prices. In addition, our customers enjoy regular discounts and bonuses.

6. 24/7 Customer Support: At Gold Grades, we have put in place a team of experts who answer all customer inquiries promptly. The best part is the ever-availability of the team. Customers can make inquiries anytime.