Moving Ice
A large mass of moving ice is known as what?
Glacier
Which 3 landforms are created by glaciers?
Large lakes
Solitary Boulders
Jagged Ridges
What is a long period of climatic cooling during which the continents are glaciated repeatedly.
Ice age
What are cycles of partially melting and refreezing snow called?
Firn
What is it called when snow remains on the ground all year long at high elevations?
Snowfield
What is another name for continental glaciers?
Ice Sheets
Glaciers move through narrow V-shaped river valleys to form what shape?
U-shape
How does biological evidence show glaciation?
Shells from dead organisms.
By which two processes did glaciers create the three landforms?
Erosion
Deposition
What are sharp, pyramid-like peaks that form because of the erosion of cirques?
Horn
By which two processes do glaciers move?
Basil slip
Internal plastic flow
What are steep bowl-shaped dpressions produced by glacial erosion?
Cirque
How much of Earth's surface did glaciers cover during the last glacial period?
1/3
How are landscapes eroded by continental glaciers different from the landscapes eroded by alpine glaciers?
They are smooth and rounded
When ice melts, a tributary valley is suspended high above the main valley floor creating a hanging valley. When water flows from a hanging valley, what forms?
waterfall
What forms on the surface as a result of uneven flows of tension and compression beneath the surface of a glacier?
Crevasses
Rock surfaces scratched and grooved by rocks carried at the base of the ice sheet are parallel to what?
The direction of glacial movement.
What theory states that Earth's orbit and tilt cause climatic change?
Milankovitch Theory
What are icebergs?
parts of ice that break off ice shelves and float into the ocean.
By which process does the interior of a glacier move? By which process does the entire glacier move?
Internal Plastic Flow
Basil Slip
The size of a glacier depends on what two things?
Amount of snowfall received
Amount of ice lost
What is the difference between a till and a moraine?
Till is unsorted material deposited by a glacier and a moraine is the landform that is created from the deposits.
What is the difference between Glacial and Interglacial periods?
Glacial- cool climate characterized by advancement of glaciers
Interglacial- warm climate characterized by retreat of glaciers.
Changes in the amount of what type of energy is caused by changes in Earth's position relative to the sun?
Solar
Why are glaciers called "Rivers of Ice"?
gravity causes both glaciers and rivers to flow downward