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Bss Esc 8-12
Chapter 11
28
Science
11th Grade
01/11/2009

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Term

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[image][image]Arete[image][image]

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Definition
a sharp rugged mountain ridge, produced by glaciation.
Term
[image][image][image]Calving
Definition
To break at an edge, so that a portion separates. Used of a glacier or iceberg.
Term

 

Cirque

Definition
a bowl-shaped, steep-walled mountain basin carved by glaciation, often containing a small, round lake
Term
[image][image][image][image][image][image][image]continental glacier
Definition
a glacier that spreads out from a central mass of ice
Term
crevasses
Definition
A deep fissure in a glacier or other body of ice. Crevasses are usually caused by differential movement of parts of the ice over an uneven topography.
Term
Drumlins
Definition
An elongated hill or ridge of glacial drift.
Term
Erratics
Definition
noting or pertaining to a boulder or the like carried by glacial ice and deposited some distance from its place of origin.
Term
Esker
Definition
A long, narrow ridge of coarse gravel deposited by a stream flowing in or under a decaying glacial ice sheet. Also called os3
Term
Firn
Definition
Granular, partially consolidated snow that has passed through one summer melt season but is not yet glacial ice. Also called old snow.

Term
glacial trough
Definition
happening or moving extremely slowly: The work proceeded at a glacial pace.
Term
glacier
Definition
an extended mass of ice formed from snow falling and accumulating over the years and moving very slowly, either descending from high mountains, as in valley glaciers, or moving outward from centers of accumulation, as in continental glaciers.
Term
horn
Definition
one of the bony, permanent, hollow paired growths, often curved and pointed, that project from the upper part of the head of certain ungulate mammals, as cattle, sheep, goats, or antelopes.
Term
Ice Caps
Definition
An extensive dome-shaped or platelike perennial cover of ice and snow that spreads out from a center and covers a large area, especially of land.
Term

ice front

Definition
the forward section or seaward edge of an ice shelf.
Term
ice sheet
Definition
a broad, thick sheet of ice covering an extensive area for a long period of time.
Term
kames
Definition
A short ridge or mound of sand and gravel deposited during the melting of glacial ice.
Term
kettles
Definition
A steep, bowl-shaped hollow in ground once covered by a glacier. Kettles are believed to form when a block of ice left by a glacier becomes covered by sediments and later melts, leaving a hollow. They are usually tens of meters deep and up to tens of kilometers in diameter and often contain surface water.
Term
moraine
Definition
a ridge, mound, or irregular mass of unstratified glacial drift, chiefly boulders, gravel, sand, and clay.
Term
nunataks
Definition
a hill or mountain that has been completely encircled by a glacier.
Term
outwash
Definition
the material, chiefly sand or gravel, deposited by meltwater streams in front of a glacier.
Term
outwash plain
Definition
The outwash plain, which lies beyond the snout of a glacier or away from the margins of an ice-sheet, is composed of glacial sands and gravels transported and deposited by meltwater streams.
Term
roches moutonnees
Definition
An elongate mound of bedrock worn smooth and rounded by glacial abrasion.


Term
rock flour
Definition
Finely ground rock particles produced by glacial abrasion. Also called glacier meal.
Term
snow line
Definition
the latitudinal line marking the limit of the fall of snow at sea level.
Term
striations
Definition
One of a number of parallel lines or scratches on the surface of a rock that were inscribed by rock fragments embedded in the base of a glacier as it moved across the rock.
Term
till
Definition
glacial drift consisting of an unassorted mixture of clay, sand, gravel, and boulders.
Term
valley glacier
Definition
Ice sheets and ice caps cover vast areas and are unconstrained by the underlying topography.
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