Glaciers Worksheet
How many glaciers form an arête?
2
How many glaciers form a horn?
3
The largest glaciers are called _____ or _____
Continental glaciers; ice sheet
Large crack in glaciers
Crevasse
Deep cracks called ____ may develop in the brittle ice in the upper/brittle zone in the top 50 meter of ice
Crevasses
Canoe-shaped hills which point in the direction a glacier moved
Drumlin
Large boulders transported by glaciers
Erratic
Ice-transported boulders found far from their place of origin are called glacial:
Erratics
A serpentine-like ridge is called an ___ and is composed of _____ deposited by a stream flowing along the bottom of a glacier
Esker; sand & gravel
A glacier flowing down a steep slope will move _____ & more than one on a more level surface
Faster
Glaciers move downslope in response to ____
Gravity
period of glaciation
Ice age
The percentage of land that was covered by glaciers during the Great ice age is estimated to be about ___%
30
The largest glacier on Earth almost completely covers the continent of ______
Antartica
Movement at the base of a glacier due to meltwater reducing friction
Basal slip
The more plastic ice is in the plastic/____ zone within the glacier
Bottom
Process which forms an iceberg
Calving
Semicircular basin found that the head of a glacial valley
Cirque
Steep-walled, semicircular depressions called ____/_____ may develop near the head of a valley glacier
Cirques; tarn
Glacier which spreads outward in all direction
Continental
Compressed snow and ice which becomes a glacier
Firn
Granular ice called _____ May be compressed to form glacial ice
Firn
When a glacial valley is invaded by the sea, a ___ is formed
Fjord
Unsorted, unstratified sediments deposited by glaciers are collectively known as:
Glacial till
A mountainous, isolated, pyramid-shaped, mass of glacial rock is a:
Horn
The end of a glacier
Ice front
A glacier is a mass of land ____ consisting largely of recrystallized _____
Ice; snow
Blocks of ice that float out to sea are called:
Icebergs
The latitude of the mountain largely determines the position of the ____
Icefront
Small, cone-shaped hill of stratified sand and gravel
Kame
A bowl-shaped hollow found in moraines and outwash plains
Kettle
The ice front receded during the ____ periods of the Ice Age
Late/end
Moraine formed along the sides of glaciers
Lateral
When glaciers reach areas of higher temperature they begin to ____
Melt
Outwash consists of sediment deposited by the action of glacial _____/____
Melt water; outwash
Deposit of glacial till
Moraine
Streamlined, elongated hills composed of till are called:
Moraine
Mountain peaks that project through a continental glacier
Nunatak
Deposites from glacial meltwater
Outwash
Deformational movement within a glacier
Plastic flow
The process whereby rocks are eroded by glaciers is called:
Plucking
Name of the South Fork of LI moraine
Ronkonkoma
Glaciers originate in poles or mountains above the ______
Snow line
Point above which snow and ice cover the ground throughout the year
Snow line
Long, parallel scratched in bedrock
Striation
Moraine formed at the farthest point a glacier advanced
Terminal
Unsorted, unstratified rock material from glaciers
Till
The typical glaciated valley is ____ shaped
U
Confined, slow-moving glacier
Valley
Glaciers originating in snowfield at the head of mountain valleys are called ____ or _____ glaciers
Valley; alpine
Large mass of compacted snow and ice that moves under the force of gravity
glacier
Pyramid-shaped peak
horn