Dynamic PlanetGlaciers

Abby Rooney

http://nsidc.org/cryosphere/glaciers/questions/types.htmlThanks to Rachel Richards for sharing this link!

Ice SheetsLarge sheets of ice expanding over 50,000 kilometers

Antarctica & Greenland

Antarctica- 4,200 meters thick ice sheet

Ice sheets cover everything but Transantarctic Mountains (Antarctica)

Ice ShelvesHappens when ice sheets float on water

Few hundred meters – 1,000 meters

Surround Antarctic continent

When retreating, may show climate change

Ice CapsMiniature ice sheets

< than 50,000 kilometers

Polar & sub-polar regions

Greenland- ice sheet

Iceland- ice cap

Ice StreamsChannelized glaciers that flow rapidly

Many Ice streams in Antarctica

Ice FieldsSmaller than ice caps

Flow: underlying topography

Mountain GlaciersFlow out of ice fields

Span several peaks or a whole mountain range

Places: Arctic Canada, Alaska, Andes, Himalayas, Antarctica

Valley GlaciersCome from mountain glaciers or ice fields

Slide down valleys

Look like giant tongues

Long; flow beyond snow line

May reach sea level

Piedmont GlaciersHappen when steep valley glaciers spill into flat plains

Spread into bulb-like lobes

Malaspina Glacier, Alaska: 5,000 square kilometers

Cirque GlaciersNamed for bowl-like hollows (they live there)

High mountainsides

Wide

Hanging GlaciersIce aprons

Cling to steep mountainsides

Wide

Common in Alps- cause Avalanches

Tidewater GlaciersFlow far enough to reach out into the sea

Responsible for splitting small icebergs

May cause problems for shipping lanes

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