Mt. Robson by Lawren Harris Glaciation Mt. Robson by Lawren Harris http://www.groupofsevenart.com/
Processes that erode:
Processes that erode: Water
Processes that erode: Water Wind
Processes that erode: Water Wind Ice
The Glacier by Arthur Lismer Glaciation The Glacier by Arthur Lismer http://www.bertc.com/subtwo/lismer15.htm
Glaciation is a Glacial Period or Ice Age The earth has experienced several ice ages 2 billion years ago 600 million years ago 250 million years ago (Pangea) 1 to 2 million years ago Most recent was 100,000 years ago, ending 6,000 years ago Ice sheets covered almost all of Canada, up to 4 km thick Due to cold climate, enormous amounts of water were frozen in ice sheets causing the level of oceans to fall Ice sheet is a mass of ice larger than 50,000 km²
Glaciation is a Glacial Period or Ice Age The earth has experienced several ice ages 2 billion years ago 600 million years ago 250 million years ago (Pangea) 1 to 2 million years ago Most recent was 100,000 years ago, ending 6,000 years ago Ice sheets covered almost all of Canada, up to 4 km thick Due to cold climate, enormous amounts of water were frozen in ice sheets causing the water level of oceans to fall. Ice sheet is a mass of ice larger than 50,000 km²
The Water Cycle http://classroom.aws.com/lessons/EarlyYears/images/WaterCycle.jpg
What is a glacier? A glacier is a large, slow moving piece of ice, formed from compacted layers of snow, that slowly deforms and flows in response to gravity.
What is a glacier? A glacier is a large, slow moving piece of ice, formed from compacted layers of snow, that slowly deforms and flows in response to gravity.
Glacier Formation Earth’s climate is cool Snow that falls does not completely melt Over many years, the snow gets deeper and becomes hundreds and thousands of metres thick. Tremendous weight of snow on top causes the bottom layers to turn to ice that is very dense. This pressure causes glaciers to move…in different ways
Glacier Formation Earth’s climate is cool Snow that falls does not completely melt Over many years, the snow gets deeper and becomes hundreds and thousands of metres thick. Tremendous weight of snow on top causes the bottom layers to turn to ice that is very dense. This pressure along with gravity causes glaciers to move…in different ways
Two types of glaciers: Alpine Glaciers Continental Glaciers
Alpine Glaciers Are found in mountain regions Move under the force of gravity Sharpen the upper portions of the mountain Scrape away the valley walls to produce U-shaped valleys Moraine is formed from the debris Oak Ridges Moraine http://geology.about.com/library/bl/images/blglacierval.htm http://www.flickr.com/photos/davejglaves/1191311285/
Alpine Glaciers Are found in mountain regions Move under the force of gravity Sharpen the upper portions of the mountain Scrape away the valley walls to produce U-shaped valleys Moraine is formed from the debris Oak Ridges Moraine http://geology.about.com/library/bl/images/blglacierval.htm http://www.flickr.com/photos/davejglaves/1191311285/
The Columbia Icefield http://www-mtl.mit.edu/~fana/Alaska_trip/Icefield_pwky/columbia_01_medium.jpg
The Columbia Icefield http://www-mtl.mit.edu/~fana/Alaska_trip/Icefield_pwky/columbia_01_medium.jpg
The Columbia Icefield http://www-mtl.mit.edu/~fana/Alaska_trip/Icefield_pwky/columbia_01_medium.jpg
The Columbia Icefield http://www-mtl.mit.edu/~fana/Alaska_trip/Icefield_pwky/columbia_01_medium.jpg
Continental Glaciers Cover large areas of land Move under own weight Spread outward from center or zone of accumulation Edge or margin of glacier can advance, retreat or stay in one place. Smoothes the landscape by eroding high points and filling in lower areas http://www.uwsp.edu/geo/faculty/ritter/images/lithosphere/glacial/glacier_zones.jpg http://www.swisseduc.ch/glaciers/glossary/icons/glacier-advance.jpg
Continental Glaciers Cover large areas of land Move under own weight Spread outward from center or zone of accumulation Edge or margin of glacier can advance, retreat or stay in one place. Smoothes the landscape by eroding high points and filling in lower areas http://www.uwsp.edu/geo/faculty/ritter/images/lithosphere/glacial/glacier_zones.jpg http://www.swisseduc.ch/glaciers/glossary/icons/glacier-advance.jpg
Continental Glaciers continued This erosion can expand existing river valleys, making them deeper and wider U-shaped Valleys Can also make lakes deeper and wider The Great Lakes were formed this way Once covered and shaped the Canadian Shield but today they only exist in Greenland and Antarctica. http://www.novaspace.com/POSTERS/PHOTO/GreatLakes.jpeg
Continental Glaciers continued This erosion can expand existing river valleys, making them deeper and wider U-shaped Valleys Can also make lakes deeper and wider The Great Lakes were formed this way Once covered and shaped the Canadian Shield but today they only exist in Greenland and Antarctica. http://www.novaspace.com/POSTERS/PHOTO/GreatLakes.jpeg
Questions How are glaciers formed? How do glaciers move? What are the main differences between an Alpine and Continental Glacier? Where can we find glaciers today? Which areas of Canada were shaped by Glaciation? How were the Great Lakes formed?