1. Section 4
Glaciers

2. Key Terms

3. Glacier Any large mass of ice that moves slowly over land
There are 2 kinds of glaciers continental and valley

4. Continental
Valley
A glacier that covers much of a continent or large island
A long narrow glacier that forms when snow and ice build up high in a mountain valley

5. Ice Ages
When continental glaciers have covered large parts of Earths surface
Plucking
When rocks freeze at the bottom of glaciers while they’re moving

6. Till
The mixture of sediments that a glacier deposits directly on the surface
Ex. Clay silt sand and gravel
Moraine
Till deposited at the edges of a glacier forming a ridge
Kettle
A small depression that forms when a chuck of ice is left in a glacial till

7. Key Concepts What are the two types of glaciers?
Valley and continental
How does a valley glacier form and move?
When snow and ice move
How do glaciers cause erosion and deposition?
It brings up some of the snow and erodes it

8. The End