Shared Flashcard Set

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CH17
vocab
24
Geography
Undergraduate 2
05/05/2013

Additional Geography Flashcards

 


 

Cards

Term
glaciers
Definition
natural bodies of land ice that flow- form when snow accumulates to great depths
Term
ablation
Definition
loss of snow and ice by evaporation or melting
Term
glacier plucking
Definition
glacier breaks away chunks of bedrock; exploits pre-existing fractures in bedrock
Term
arete
Definition
sharp jagged mountain ridges
Term
fjord
Definition
U-shaped valley carved by glacier which is filled with ocean water
Term
icebergs
Definition
form when freshwater, glacial ice flows into oceans, breaks into big chunks and floats free;
Term
sea ice
Definition
much thinner and more continuous; formed by the direct freezing of ocean water with snow accumulation on top (THINNER/ CONTINUOS)
Term
pack ice
Definition
sea ice/frozen ocean water that completely covers sea surface (north pole)
Term
glacial drift
Definition
all sediment and rock debris that is deposited by glaciers
Term
till
Definition
unstratified glacial drift deposited directly by glaciers
Term
terminal morraine
Definition
which makes furthest limits of glaciation; curved pattern
Term
lateral morraine
Definition
markes side of alpine glacial trough where edge of ice touches the wall
Term
medial morraine
Definition
merge of 2 glaciers; when 2 alpine glaciers converge, their lateral moraines merge and new combined glacier has one moraine then run down middle of combined glacier
Term
drumlin
Definition
rounded oval hill formed of till; inverted teaspoon
Term
till plain
Definition
what was on bottom of glacier
Term
stratified drift
Definition
outwash plain; melt water streams issued from glacier; layer upon layer of sand and gravel carried by meltwater streams
Term
eskers
Definition
sediment deposited by meltwater streams that are flowing in ice tunnels underneath glaciers; long sinuous ridges of sediment that were deposited in tunnels; marks ice tunnels when glacier melts
Term
deglaciation
Definition
widespread recession of ice sheets (occurs during periods of warming global climate)
Term
interglaciation
Definition
time period between two glaciations
Term
decreased solar output
Definition
sun is not working as hard to produce;
Term
eccentricity
Definition
how close earth and sun are; take place every 100 thousand years
Term
obliquity
Definition
wobble in earth’s rotational axis with respect to plane of earth’s orbit; 41 thousand year circle
Term
precession
Definition
change in rotational axis in respect to stars; complete cycle is 26 thousand years
Term
milancovich theory
Definition
3 factors; combined effects of 3 factors corresponds roughly to ice ages of last million years
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