Flashcards in Moraine Deck (16)
Where is lateral moraine found?
Sides of glaciers.
What is important in lateral moraine?
Scree from frost shattering is an important source.
Where is medial moraine found?
Down the middle of the glacier surface.
When does medial moraine occur?
When the inner lateral moraine of 2 glaciers join.
Where is ground moraine found?
At the base (bottom) of the ice.
What is ground moraine also called?
Till or boulder clay.
Where does ground moraine come from?
Abrasion on the base of the glacier.
Where is terminal moraine found?
In front of the snout of the glacier.
What does terminal moraine represent?
The maximum advance of the ice.
What moraine is the largest and widest?
Where is recessional moraine found?
Behind terminal moraine, but not as wide or high.
What does recessional moraine mark?
Where the glacier has retreated and then stopped retreating depositing material.
Moraine is angular rock fragments, this includes what?
Rock fragments resulting from freeze-thaw weathering.
What is a basal slip?
Glacier sliding over the bed due to melt water under the ice acting as a lubricant.
What can basal slips sometimes cause?
Sudden movements in the glacier.