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Dynamic Planet stack
dynameic planet stack created for regionals
| Term | Definition |
|---|---|
| firn | year-old snow found in the accumulation area; an intermediate state between snow and glacier ice |
| accumulation area | usually the part of the glacier with the highest elevation |
| ablation area | where most of the melting and evaporation occur; glacier is in equilibrium |
| equilibrium | snowfall=snowmelt |
| crevasses | giant cracks; created where glacier flows rapidly with extensional flow |
| head | uphill top end |
| terminus | downhill end |
| downhill end | area between summer melting and accumulation area where snow lasts from season to season |
| superglacial streams | streams on the surface of glaciers that carry surface melt water |
| equilibrium line altitude | average position of the firn line |
| superglacial debris | a large amount of dust and rocky material scattered over the surface of a glacier |
| moraine | as a glacier retreats, the ice melts away from underneath the ___ so they leave long narrow ridges that show where the glacier used to be |
| medial moraines | un down the middle of a glacier or in the middle of two merging glaciers |
| lateral moraines | moraines along the sides of a glacier |
| terminal moraines | mark the glaciers furthest forward advance |
| moulin | hole/tunnel exposed on the glacial surface through which meltwater flows |
| ice shelves | occur when ice sheets extend over the sea and float on water |
| ice streams | channelized glaciers that flow more rapidly than the surrounding body of ice |
| calving | a glacier with a terminus that ends in a body of water into which it calves icebergs; The breaking away of large blocks of ice from the snout of a glacier to form icebergs. |
| alpine | glaciers found in a mountainous region; flow down valleys |
| piedmont | when a glacier extends down a steep valley onto a relatively flat plain; has a bulb-like lobe that forms at the terminus of the glacier |
| tidewater | valley glaciers that flow far enough to reach out into the sea; lots of calving happens |
| hanging | aka ice aprons; glacier that clings to steep mountainsides; wider than they are long |
| cirque | named after the bowl-like hollows they occupy; found high on mountainsides and are wider than they are long |
| continental | dome-shaped glaciers that flow away from a central region and are largely unaffected by the land's topography; larger than alpine |
| roches mountonnees | asymmetrical bedrock hills that point in the direction the glacier flowed; back of each hill is gently sloping and has been polished smooth; front is jagged and steep |
| ice sheets | enormous continental masses of glacial ice and snow; largest of glaciers |
| ice fields | similar to ice caps, but typically smaller; their flow is influenced by the underlying topography |
| ice caps | mini ice sheets; relatively flat and high in elevation |
| sea ice | reflects incoming solar radiation and blocks ocean water from sinking, thus preventing thermohaline circulation of ocean currents |
Created by:
Xox142
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