glaciers chapter 5 honors earth science. what is a glacier? a thick mass of moving ice 20glacier.jpg
TRANSCRIPT
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GLACIERS
CHAPTER 5
HONORS EARTH SCIENCE
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What is a glacier?
a thick mass of moving ice
http://www.jadecoast.ca/Sawyer%20glacier.JPG
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How do glaciers form?
Step 1: Snow accumulates.
More snow falls during the winter than melts in the
summer.
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Trans Labrador Highway
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Step 2: Snow changes to firn.
As snow accumulates, its weight compress
the individual snowflakes to form
firn.
FIRN
http://www.gsw.edu/~bcarter/physgeol/glac/firn.jpg
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Firn
http://crevassezone.org/Photos/Graphics/3441L-(Firn).jpg
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Step 3: Firn is compressed to form solid glacial ice.
http://patti.tensegrity.net/album/alaska/thompson/ice4.jpg
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http://www.asf.alaska.edu:2222/img/firn_diagram.gif http://207.239.98.44/IcelandI%20232.jpg
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Step 4: The ice begins to move.
Plastic flow- weight of glacier moves out like pancake batter
http://www-math.science.unitn.it/Bike/Countries/Europe/Tour_Reports/Tour_of_the_Alps/Gallery/glacier.jpg
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When the climate cooled…
Ice advanced over the land, moving southward from Canada over the Great Lakes Region.
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Glaciar Perito Moreno, in Santa Cruz province, Argentina. It hasn’t happened since 1988 and it is said to be one of the most extraordinary natural events in the world.
- Roberto Cerrudo
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Glacier terms
• Zone of Ablation- melting• Zone of Accumulation- snow accumulates
• Crevasse- cracks
• Advance- more accumulation than melting• Retreat- more melting than accumulation
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VALLEY GLACIER
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How do glaciers erode the surface?
• Plucking –freeze/thaw process lifts particles into ice
Striations- parallel scratches made from rocks in ice scraping against bedrock
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Glaciers pick up lots of sediment as they advance over the land.
http://www.geographyjim.org/Newzealandglacier.jpg
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TYPES OF GLACIERS
• Alpine (Valley)Glaciers – glaciers that form at high elevation in mountain valleys
• Ice sheets or Continental Glaciers form in polar regions such as Greenland and Antarctica.
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http://daac.gsfc.nasa.gov/DAAC_DOCS/geomorphology/GEO_9/geo_images_9/Fig9.20.gif
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Cirque
• A bowl-shaped depression located where a glacier begins to form
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http://crevassezone.org/Photos/Graphics/4163L-(Cirque).jpg
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Horn
• A tall, pointed rock peak left at the top of a mountain
http://www2.nature.nps.gov/geology//parks/glac/car0348.jpg
Kinnerly Peak - Glacier National Park
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The most famous horn in the Alps… The Matterhorn
• Located on the boundary between Switzerland and Italy, the Matterhorn’s summit is 4478 m above sea level.
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Arete – spines or ridges of rock that separate glacial valleys
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U-shaped Valley - Yosemite National Park
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V-shaped valleys become U-shaped valleys as glaciers move through them…
A typical river valley
Over time, running water cuts a deeper V-shape.
Step 1 Step 2
Step 3 Step 4Glacier fills valley, widening and straightening the channel
Glaciers melt leaving a U-shaped valley
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Hanging Valley
• a small valley that has not eroded as deep as the main valley that it is connected to
• Waterfalls often form at hanging valleys.
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TYPES OF GLACIAL DRIFT(Sediments)
• TILL- unsorted; deposited by ice
• STRATIFIED DRIFT- layered; deposited by meltwater streams
• OUTWASH- sorted sand; deposited by meltwater
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Erratics
•Boulders carried great distance by the glacier
•Don’t match surrounding rock
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Erratics along Lake Michigan Shoreline
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TYPES OF GLACIERS
• Alpine (Valley)Glaciers – glaciers that form at high elevation in mountain valleys
• Ice sheets or Continental Glaciers form in polar regions such as Greenland and Antarctica.
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MORAINES
• Deposited along edge of glacier during melting
• Terminal- very end of glacier
• Lateral- side of glacier• Recessional-
progresses behind terminal
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MORAINES
• MADE OF TILL- unsorted sediment
http://www.helsinki.fi/~jhyvonen/PB/M/Cerro%20Tronador%20moraine-pp.JPG
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terminal moraine – unsorted sediments deposited at the edge of the melting glacier
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Ground Moraine- flat till deposits between recessional moraines
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Kettle Lakes
• Made from ice blocks
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Kettle Lakes
• Kettle lakes form when blocks of ice break off the front edge of a glacier, become buried by sediment. The ice melts leaving a hole which fills with water creating a lake.
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Drumlins
• Hills of sediment deposited by the glacier- till
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ESKERS
• Winding ridges of stratified drift
• Deposited by meltwater streams
• Mined for gravel
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KAMES
Cone shaped deposits
Deposited at end of meltwater streams
Stratified drift
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Why do scientists believe that glaciers once covered Michigan?
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Moraine Deposits = unsorted sedimentsMoraines are made of unsorted sediments.
Only mass movements and glaciers deposit
unsorted sediments.
Since there are no large hills or
mountains in Michigan for this sediment to fall
down, it must have been deposited by the
glaciers.
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Moraine Deposits have the same shape as the Great Lakes.
• Michigan moraines run parallel to the shoreline.
• The same process that formed the moraines formed the Great Lakes.
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Each of the Great Lakes began as a river.
Image from Earth Science, Tarbuck and Lutgens, 2003
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As the climate cooled…
• The rivers froze.
• Glaciers moved through them – widening and deepening them to form today’s lake bottoms.
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• The sediment removed from the river valleys was deposited in the moraines covering our state. This is why the moraines run parallel to the shorelines of the Great Lakes.
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When the climate began to warm, the glaciers began to melt and retreat.
http://www.msstate.edu/dept/geosciences/CT/TIG/WEBSITES/LOCAL/Spring2002/Michael_Marsicek/images/Great_Lakes_Formation.gif
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The fresh water from the melting glaciers filled in the deep U-shaped valleys that they had carved and
turned them into the lakes we have today.
http://www.ofps.ucar.edu/gapp/networks/images/greatlakes_map.jpg
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What other evidence do we have that glaciers once covered our state?
• Depositional features such as drumlins and kettle lakes.
Kalkaska, Michigan
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Kettle Lakes
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Why do scientists believe that glaciers once covered Michigan?
• Michigan is covered with unsorted moraine deposits.
• The moraine deposits follow the outline of Great Lakes..
• Erratics
• striations
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http://homepage.tinet.ie/~jconsidi/BWS/karst4.jpg
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Kelly’s Island, Ohio
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Kelly’s IslandGlacial grooves
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Granite Island, Lake Superior MI
Calumet, MI
N47°14’77’’ W88°26’82’’
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Resources• http://cse.cosm.sc.edu/erth_sci/Erosion/plucking.jpg
• http://www.skidmore.edu/academics/geo/courses/ge101/Pictures/Glaciers/GlacialStriations.jpg
• http://www.go2moon.com/image/Valdez-Glacier.jpg
• http://www.glaciers.pdx.edu/kennicott/photos99/glacier.jpg
• http://www.brownbearsw.com/photos/pws/moraine.jpg
• http://www.homepage.montana.edu/~geol445/hyperglac/depproc1/moraine.JPG
• http://www.ucalgary.ca/~dgsmit/MORAINE.jpg
• http://mac01.eps.pitt.edu/harbbook/c_viii/images/icefields/Hwb0530.GIF
• http://www.geographyhigh.connectfree.co.uk/s3glacgeoghigh34b.gif
• http://www.uwsp.edu/geo/faculty/lemke/images/lithosphere/drumlin_diagram_small.gif
• http://online.sd43.bc.ca/della/images/drumlin.jpg
• http://www.geology.wisc.edu/~qlab/g420/drumlin.jpg
• http://www.bbc.co.uk/scotland/education/bitesize/standard/img/geography/glaciation/g98.gif
• http://pbisotopes.ess.sunysb.edu/esp/Science_Walks/carmans/kettle-hole.gif
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• http://perth.uwlax.edu/faculty/stoelting/Intro/Guides/Images3/southern_Kettle_Moraine_lakes_WI_800.jpg
• http://images3.vrbo.com/vrbo/images/18982c.jpg• http://www.on.ec.gc.ca/greatlakeskids/images/g_lakes_form.gif• http://wrgis.wr.usgs.gov/docs/parks/glacier/UvalleyB.gif• http://wrgis.wr.usgs.gov/docs/parks/glacier/UvalleyC.gif• http://www.jchl.co.uk/photos/greenland/Valley.jpg• http://www.emporia.edu/earthsci/student/martel1/ice.jpg• http://wrgis.wr.usgs.gov/docs/parks/glacier/gifJPGdisplay.html• http://www.uwsp.edu/geo/faculty/lemke/alpine_glacial_glossary/images/mor
e_examples/canada_cirque01_dh.jpg• http://www.uoregon.edu/~millerm/Kluane1.jpeg• http://people.surfaceeffect.com/pete/photos/folksholiday/yosemitevalley/vall
ey2.jpg• http://www.theotherpages.org/images/image200.jpg• http://www.northforkmedia.com/spiveyscience/images/glacialerosion/
pages/grinnellcirqueareteetc_jpg.htm• http://www3.uakron.edu/modlang/97trip/d16f.jpg• http://tvl1.geo.uc.edu/ice/Image/icland/Greenland.html• http://www.bougerolle.net/photos/matterhorn.jpg
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• http://perth.uwlax.edu/faculty/stoelting/Intro/Guides/Images3/glacial_erratics_Lake_Michigan_WI_800.jpg
• http://www.fettes.com/Cairngorms/images/Easter_Island.jpg
• http://rt23.com/Scenery/spring/images/tripod_rock.jpg
• http://ic.ucsc.edu/~rocks/eart109/Photo_Composition/Top_Pothole.jpg
• http://perth.uwlax.edu/faculty/stoelting/Intro/Guides/Images3/southern_Kettle_Moraine_lakes_WI_800.jpg