GEOL 111 Valhalla High School Earth Cryosphere and Drylands Lab Report: Geology Answers 2021

GEOL 111 Valhalla High School Earth Cryosphere and Drylands Lab Report: Geology Answers 2021

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GEOL 111 Valhalla High School Earth Cryosphere and Drylands Lab Report

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Student Name: ______________________
Date: ______________
Physical Geology 111 Lab
Glaciers and Deserts
I. Introduction & Purpose:
The purpose of this laboratory exercise is to learn about Earth?s Cryosphere and drylands. Students
should be able to answer what the Cryosphere is and how changes within it affect other parts of the
Earth system. Students should also be able to identify characteristic processes, landforms, and
hazards of drylands.
II. Cryosphere Inquiry
A. The Cryosphere is all of Earth?s snow and ice. Use Figure 1 to answer the following questions.
1. In Figure 1, what is the sequence of Cryosphere regions that you would encounter on the
ground if you traveled from Mexico (a beige- to yellow-colored region with no snow or ice) to
the North Pole?
2. Notice in Figure 1 that mountain glaciers and ice caps occur in parts of Greenland, Canada,
Russia, Alaska, and the western conterminous United States. Some mountain glaciers also
exist very close to the equator (not shown in Figure 1). How do you think it is possible for
glaciers to exist at the equator?
3. If the temperature of Earth?s atmosphere were to rise, then how do you think it would affect the
Cryosphere, hydrosphere, and biosphere?
4. If the temperature of Earth?s atmosphere were to cool, then how do you think it would affect the
Cryosphere, hydrosphere, and biosphere?
B. How have glaciers affected landscapes? Use Figure 2 to answer the following question.
1. Name two resources (used by humans) that were created by glaciers?
2. In what ways have the glaciers affected the landscape in the above image, and what does it
suggest about how extensive these glaciers must have been in the past?
C. Refer to Figure 3 to fill out the Nisqually Glacier Data Chart below. To do this, use a ruler and the
map?s bar scale to measure the distance in kilometers from Nisqually River Bridge to the position
of the glacier?s terminus (red dot) for each year of the chart. Be sure to record your distance
measurements to two decimal points (hundredths of km).
1. Fill in the chart.
Distance in kilometers from
Nisqually River Bridge to
terminus of Nisqually
Distance in kilometers from
Nisqually River Bridge to
terminus of Nisqually
2. You should notice that the glacier terminus retreated up the valley at some times, but advanced
back down the valley at other times. Summarize these changes and what they imply for
temperature changes in this area.
D. Refer to Figure 4, which shows climatic data provided by the NOAA National Climatic Data Center
(NCDC). NCDC?s global mean temperatures are mean temperatures for Earth calculated by
processing data from thousands of observation sites throughout the world (from 1880 to 2009).
The temperature data were corrected for factors such as increase in temperature around urban
centers and decrease in temperature with elevation. Although NCDC collects and processes data
on land and sea, this graph only shows the variation in annually averaged global land surface
temperature since 1880.
1. Describe the long-term trend in this graph?how averaged global land surface temperature
changed from 1880 to 2005.
2. Describe how the changes in position of the terminus of Nisqually Glacier (II. C.) Compare to
the variations in annually averaged global land surface temperature. Be as specific as you can.
3. Based on all of your work above, do you think Nisqually Glacier can be used as a global
thermometer for measuring climate change? Explain.
III. Dryland Inquiry
A. When most people think of drylands and deserts, they imagine hot sandy landscapes. Most of the
southwestern United States is desert, including the Sonoran Desert of southern California and
Arizona. However, most of the Sonoran Desert is rocky landscapes. Sandy areas are present, but
limited, like the Algodunes Dune Field in Figures 5 and 6. This is the location where Star Wars
producers filmed desert scenes of the film?s planet Tatooine.
1. Notice the sand dunes of the Algodunes Dune Field in Figure 6. Why do you think there are no
plants growing on the dunes?
2. Winds in the Algodunes Dune Field can reach velocities up to 60 miles per hour. This can
create hazardous conditions and the need for maintenance on the canal and Interstate Route 8.
What would be the hazard, and what maintenance would be needed periodically on the canal
and Interstate Route 8 as a result of the hazard?
3. The U.S. Bureau of Land Management as Imperial Sand Dunes Recreation Area manages this
region. Portions of the dunes are available for operating off-road vehicles. What effect do you
think the operation of off-road vehicles here would have on plant growth and the hazards you
described above?
B. Death Valley occurs in the Mojave Desert. Analyze the images of the Death Valley region in
Figures 7 and 8.
1. Notice in Figure 7 that steep mountainous slopes occur on both sides of Death Valley. Also notice
that there is almost no soil or vegetation on the slopes. Describe what you think conditions would
be like in the river valleys on these mountain slopes when heavy rain falls on them.
2. Notice the delta-like landforms that form at the mouths of the river in Figures 7 and 8, where the
rivers enter the valley. Explain how you think these landforms form.
3. Notice that there is no standing water in Death Valley, even though you can see that water
sometimes flows into the valley from the mountains. It is a closed basin (meaning that water has
no way to drain from it). It is also the hottest and driest place in North America. When there is
water on the floor of the valley, it is alkaline to salty and potable (drinkable). How do you think the
water gets so alkaline and salty?
4. Suppose you could walk down to the white patches on the floor of Death Valley in Figures 7 and 8
and examine them. Predict what materials (minerals) and conditions you would find here.
5. Residents of Furnace Creek have grassy lawns, trees, and potable water to drink. Why do you
think their water is potable?
6. The United Nations Convention to Combat Desertification (UNCCD) points out that many people
live in drylands, and that more than half of the world?s productive land is drylands. The challenge
is to manage the land so that it does not degrade to useless desert that supports no agriculture,
and to live safely. Make a list of challenges that people face when they live in drylands, and some
ways that the land could be managed to make it safer and more productive.
C. Mojave Desert, Death Valley California. Death Valley is located in the USGS 15-minute Furnace
Creek, California quadrangle (provided on the back of this activity sheet). It is the large valley
(graben) in the middle of the map and the lowest valley in the United States (Figures 7 and 8). The
mountains on each side of the valley are horsts (Figure 9).
1. Notice on Figure 10 that the intermittent stream that drains from the upstream end of the alluvial
fan/arroyo system A to the playa at E. How would the grain size of the sediments along this
stream change as you walk downslope from the high arroyo to the playa (E)? Why?
2. The floor of most grabens is tilted, because fault movement is usually greater on one side of the
graben than the other. There are also half grabens, valleys developed along only one normal fault.
Carefully examine Figure 10 for evidence of faults on either or both sides of Death Valley. Do you
think that Death Valley is a graben or a half graben?
3. Notice that people chose to build a ranch on an alluvial fan C, even though this entire region is
dryland. What do you think was the single most important reason why those people chose this
alluvial fan C for their ranch instead of one of the other fans?
IV. Glaciers and Drylands Laboratory Reflection
Directions: Write a reflection of the lab activity, explaining its purpose, the methods used, the results
obtained, and a brief personal reflection of what you enjoyed and learned about doing this lab.
1) What was the purpose of this lab? What did you actually discover and learn during this lab?
2) What did you enjoy most about this lab? Also, what was challenging or thought provoking?
Figure 1
? 2015 Pearson Education, Inc.
Figure 2
? 2015 Pearson Education, Inc.
Figure 3
? 2015 Pearson Education, Inc.
Figure 4
? 2015 Pearson Education, Inc.
Figure 5
? 2015 Pearson Education, Inc.
Figure 6
? 2015 Pearson Education, Inc.
Figure 7
? 2015 Pearson Education, Inc.
Figure 8
? 2015 Pearson Education, Inc.
Figure 9
? 2015 Pearson Education, Inc.
Figure 10
? 2015 Pearson Education, Inc.

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