Glaciation Flashcards
1
Q
What is a glacier?
A
A mass of ice formed on land from compacted and recrystallized snow
2
Q
What are the two main types of glaciers?
A
Valley (alpine) and ice sheets
3
Q
What are U-shaped valleys evidence of?
A
Glacial erosion
4
Q
How do glaciers erode rock?
A
Plucking and abrasion
5
Q
What is till?
A
Unsorted sediment deposited directly by glacier ice
6
Q
Which landform is made of ridges of till?
A
Moraine
7
Q
What are eskers?
A
Long ridges of sediment deposited by meltwater tunnels within glaciers
8
Q
What are kame terraces?
A
Ridges of sediment deposited between ice and valley walls
9
Q
What is a pluvial lake?
A
A lake that forms due to wet conditions near a glacier
10
Q
What is the Milankovitch hypothesis?
A
A theory that glaciation is driven by Earth’s orbital variations
