GEOG/ESE 103 Lab Week 6 – Glacial Process and Landforms

Lab 6: Glacial Process and Landforms
Before completing this worksheet, please careful review and
work through the Lab 6 Assignment page instructions, readings, and other
supporting material needed to complete this assignment.
IMPORTANT: For this assignment, please make sure you have
readChapter 17 from your textbook for help on this week’s lab work.
Alpine Glaciation
1. Type in
“glacier national park” to the Google Earth search bar, and zoom in close
enough to see individual landforms (eye altitude of about 5-10 miles or so).
Explore the valleys in this region.
• What
shapes do these valleys take, and how is this different than river valleys?
• Identify
and locate (using a name or geographic coordinates) one of these valleys. (1pt)
2. Identify
two different cirques and give their approximate locations (using lat/long, a
known landmark, or a distance from a point). (2pts)
3. Identify
two arêtes and give their locations. (2pts)
4. Identify
two tarns and give their locations.(2pts)
5. Identify
and name, plus give the location, of a horn peak. What does a horn peak look
like, and why does it look like this? (2pts)
6. Are the
landforms you’ve seen in questions 1-5 erosional or depositional…and how do you
know? (2pts)
7. Knowing
what you do about the energy involved in earth’s physical systems, would you
expect most depositional landforms from alpine glaciers to be located in areas
of higher or lower slopes? (2pts)
8. Type in
“Milford Sound, Southland, NZ” to the Google Earth search bar. What is the name
of the feature formed when the sea extends inland, filling glacial valleys?
9. Copy and
paste “44° 37′ 20.29″ S 167° 52′ 30.15″ E” into the search bar.
• Look
north and tilt the camera so that you are at an oblique view. What kind of
valley are you looking at? (2pts)
• Click on
some of the picture icons (blue squares) near this area…what are they showing,
and why would it not surprise you to see this here?(2pts)
10. Copy and
paste “151 14 20 W 62 33 47 N” into the search bar and zoom out so that you can
see the whole glacier.
• Which two
types of moraines can you see here? (hint, the darker regions on the glacier
are sediment) (2pts)
• Move
south to the snout of this glacier. What is the planform/stream pattern type of
the river that is forming here, and why is it this kind? (2pts)
Continental Glaciation
1. Fly to
Ely, Minnesota and zoom out to an eye altitude of about 30 miles.
• What
direction did the glaciers flow from, and how can you tell? (2pts)
• Does this
landscape seem to be dominated by erosional or depositional processes? (1pt)
2. Fly to La
Crosse, Wisconsin and zoom out so that you can see the surrounding topography.
La Crosse is in a region known as the Driftless Area.
• What is
glacial drift, and why is this region known as the Driftless Area? (check The
Driftless Area: Fewer glaciers but more topography than the rest of Minnesota
for more background information). (2pts)
• Look
closely at one of the valleys here (e.g. tilt the camera, look around). Is it
U-shaped, and why or why not? (2pts)
3. Turn on
the USGS Earth Point topo plugin for Google Earth. Instructions for downloading
and using this plugin are located on the Week 6 Lab Assignment page. Use this
plugin for the following questions.
• Fly to
Marion, NY. What landforms are clearly visible here? Which direction was the
glacier moving when these were formed? (2pts)
• Fly to
Campbellsport, WI and look about 5 miles to the east. What are the lakes that
have formed here, and how did they form? (2pts)
• About
seven miles northeast of Campbellsport is Dundee Mountain. What glacial
landform is this? (1pt)
4. Based on
your comprehension of the impact ice has had on the Earth’s landscape, how has
ice affected the state of Illinois? What evidence supports your claims? Use the
following link (Statewide Maps) to support your answers (hint – look at the
drift thickness, land cover, loess, end moraines, and ice age deposits maps).
Please answer in about 100-200 words. (4pts)
Glacial Mass Balance
1. Go to the
link on mountain glaciersto learn more about glacial responses to climate
change. On this webpage you can see a plot of global glacial thickness versus
• Ablation
refers to any loss of glacial snow/ice through melting, evaporation, calving,
or sublimation (refer to background information for more information) and is
counteracted by the addition of snow, or accumulation. Name at least 2
potential ways to change the ratio of ablation to accumulation of glacial ice.
2. Go to
link 4 (Columbia Glacier) to learn more about the Columbia Glacier in Alaska.
Download the Google Earth file called “Glacial Exercises”.
• Expand
the folder, double click the “Retreat of Alaska’s Columbia Glacier” item and
check the box. Using the time slider, explore the retreat of this glacier over
time. Check the boxes next to points A and B. Calculate the rate of glacial
retreat of the Columbia Glacier from 1986 to 2011 by measuring the distance
between these two placemarks. What is this rate (show your work) in units of
km/year? (2pts)
• If we
assume the ice of the Columbia Glacier that has been lost was 4 km wide and 1
km thick, calculate the totalvolume of ice lost between 1986 and 2011 in km3.
• Check the
box next to the “NSIDC: Climate Change” item and click on the snowflake icons
throughout Alaska, which will take you to numerous alpine glaciers. What is
happening to these glaciers? (if the photos do not show up, go to this link to
view some of the imagery) (2pts)
• Name AND
describe at least 2 potential results of the disturbance of glacial equilibrium
on either a local or global scale. (2pts)

Order Solution Now

Similar Posts