1.1 Glacial History Flashcards
Where did glaciers expand from?
North and South Poles
Where were Alpine glaciers found?
-large mountain areas
-valleys and downhills
-thousands exist
Where were Continental glaciers found?
-not many exist
-free forming and fast moving
What are Abrasions?
Glaciers gouge and scratch land
What is Plucking?
Picks up rocks and sediment as it moves
What are the three major ice sheets in Canada
-Laurentide Ice Sheet
-Keeworth Sector
-Baffin Sector
When did glacial retreat start?
17,000 years ago
What where the two places not touched my glaciers in Saskatchewan?
-Cyprus Hills
-Wood Mountains Uplands
When was Southern Saskatchewan ice free?
12,500 years ago
How long ago was most of Saskatchewan ice free?
10,000 years ago
What is a Drumlin?
Drops of sediment in long snakey rows
What is a Terminal Moraine?
The maximum advance of a glacier
What is a Outwash Plain?
Plain formed of glaciofluvial deposits due to meltwater outwash
What is an Esker?
Rivers flowing within or under glaciers
What are Kettles?
Depressions filled within water (ice fall of glaciers)
What are Kames?
Dropping sediment all at once
What are Grand Moraines?
Rocks and debris that are transported to the glacier toe in the ice and melt and dropped
What is Glacial Till?
Glacial sediment
What are is a Glacial Erratic?
Large stones or boulders dropped by glaciers
What are Primary Deposits?
Material dropped by the glaciers
What are Secondary Deposits?
Materials are reworked by the wind, water, etc.
What are examples of Eolian Deposits? (Wind deposits)
-sand dunes
-silt
How is Hummocky Topography created?
By shifting water
How are Lacustrine Deposits created? (Lake Deposit)
Solids settle then solidify to create a new layer, this process keeps repeating. Takes a long time to happen
