Types of Glaciers
Glacial Features
Glacial movement
Glacial Deposits
Bedrock and roll
100
True or False: An iceberg is a type of glacier
false (they can come from glaciers if they calve, or break off but icebergs are not glaciers)
100
What is a crevasse?
Deep cracks in the brittle top layer of glaciers caused by the movement of the glacier over uneven surfaces.
100
what is the movement called when a glacier begins to melt and get smaller?
retreating
100
What is the name of the mixture of sand, dirt, and rocks that are moved and deposited by glaciers?
till
100
what is an ourcropping
a place where rock is exposed
200
Both types of glaciers are made of frozen fresh water. About what percent of earths fresh water stores are contained in frozen glaciers?
Fresh water (68 percent)
200
What is the name of the packed together snow and ice that makes up a glacier
firn
200
Where are glaciers brittle and where are glaciers flexible, bendy, and plastic
Brittle at the surface. Flexible down below where their snow and ice is tightly packed together and flows slowly and flexibly
200
what conditions do there need to be for a glacier to accumulate mass?
has to be cold enough.
more snow falling and accumulating than melting or running off.
200
What is an erratic?
A large boulder that has been moved and then deposited by a glacier
300
What does Alpine mean?
Alpine - relating or having to do with high mountains.
300
What is the name of the steep sided bowl shaped area at the top of a mountain where valleys and glaciers originate from?
What is a Cirque
300
If a glacier plows through a river valley what shape will the valley have afterwards?
U-Shaped
300
What geographic part of New York shows how far glaciers once advanced into the United States?
long island
the whole island is a terminal moraine
300
What are striations?
striped or parallel scratches carved out by a glacier
400
What are the two largest continental glaciers?
the Greenland and Antarctic ice sheets
400
What is an extremely sharp, angled peak of a mountain caused by the erosion of Glaciers?
Horn
400
What is the force that allows glaciers to move?
Gravity
400
Describe the sediment in a moraine
unsorted
400
What is the definition of Abrasion?
Rocks and stones become embedded in the base and sides of glaciers.
500
What is the difference between Continental and Alpine glaciers?
Continental are broad flat expanding ice sheets.
Alpine are at higher elevations in mountains.
500
What is an arete?
a sharp mountain ridge.
they are usually above the snow line and were originally formed by glaciers
500
What part of the glacier is moving the fastest?
top center middle
500
How does a medial moraine form?
(hint: medial means middle)
when two glaciers merge together the medial moraine is the sediment and till they press into each other.
500
How is a Kettle Lake formed?
a large block of ice breaks off. Sediment and till piles up around it. Eventually the ice melts leaving a hole or depression that can be filled with water.